diff --git a/.gitignore b/.gitignore
index c22aa5a8e..b69d82f67 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,3 +23,5 @@ report
 test.html
 .test_report
 deploy/config.yaml
+env
+.pytest_cache
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 000000000..c07c2d41b
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,12 @@
+language: python
+python:
+  - "2.7"
+install:
+  # postgresql should be installed by default
+  - sudo apt-get install libpq-dev
+  - sudo -u postgres createuser -s `whoami` || true
+  - createdb zeus_test
+  - ./setup-python
+
+script:
+  - py.test -v
diff --git a/README.md b/README.md
index 7dda8ffd5..2e382cca2 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,6 @@
-The Zeus election server
-========================
+# The Zeus election server
+
+[![Build Status](https://travis-ci.org/pwmarcz/zeus.svg?branch=master)](https://travis-ci.org/pwmarcz/zeus)
 
 LICENCE: This code is released under the GPL v3 or later
 
@@ -8,10 +9,59 @@ This is a fork of Ben Adida's Helios server. The differences from Helios are as
 * Whereas Helios produces election results, Zeus produces a tally of the ballots cast.
 
 * This allows Zeus to be used in voting systems other than approval voting (which is supported
-  by Helios), since the vote tally can be fed to any other system that actually produces the 
+  by Helios), since the vote tally can be fed to any other system that actually produces the
   election results.
 
 * In terms of overall architecture and implementation it is closer to the [original Helios
   implementation](http://static.usenix.org/events/sec08/tech/full_papers/adida/adida.pdf) than Helios v. 3.
 
 
+## Install
+
+Install Postgres (`postgres-server`, `libpq-dev`).
+
+If necessary, create a Postgres user:
+
+    sudo -u postgres createuser -s $(whoami)
+
+Create a database:
+
+    createdb helios
+
+Ensure you have Python 2.7 and virtualenv. Setup virtualenv:
+
+    ./setup-virtualenv
+
+Activate virtualenv:
+
+    . env/bin/activate
+
+Run migrations:
+
+    python manage.py migrate
+
+## Run
+
+    python manage.py runserver 0.0.0.0:8000
+
+## Test
+
+    py.test -v
+
+## Python packages
+
+We use [pip-tools](https://github.com/jazzband/pip-tools) to manage
+dependencies:
+
+- `requirements.in` - contains list of direct dependencies, not necessarily
+  pinned
+- `requirements.txt` - auto-generated from `requirements.in`, all packages, all
+  versions pinned
+
+In order to install a new package:
+
+- activate virtualenv (`. env/bin/activate`)
+- edit `requirements.in`
+- run `pip-compile` to generate a new `requirements.txt` file
+- run `pip-sync` to install the new packages
+- test the change and commit all files
diff --git a/__init__.py b/__init__.py
deleted file mode 100644
index e69de29bb..000000000
diff --git a/data/.gitignore b/data/.gitignore
new file mode 100644
index 000000000..d6b7ef32c
--- /dev/null
+++ b/data/.gitignore
@@ -0,0 +1,2 @@
+*
+!.gitignore
diff --git a/manage.py b/manage.py
index c632a8a38..30d99ac6b 100755
--- a/manage.py
+++ b/manage.py
@@ -1,6 +1,11 @@
 #!/usr/bin/env python
 import os, sys
 
+# HACK until we upgrade Kombu.
+# See https://stackoverflow.com/questions/34198538/cannot-import-name-uuid-generate-random-in-heroku-django
+import uuid
+uuid._uuid_generate_random = None
+
 if __name__ == "__main__":
     os.environ.setdefault("DJANGO_SETTINGS_MODULE", "settings")
 
diff --git a/pytest.ini b/pytest.ini
new file mode 100644
index 000000000..16afb3dac
--- /dev/null
+++ b/pytest.ini
@@ -0,0 +1,3 @@
+[pytest]
+DJANGO_SETTINGS_MODULE = test_settings
+norecursedirs = env
diff --git a/requirements.in b/requirements.in
new file mode 100644
index 000000000..ea4b26cc9
--- /dev/null
+++ b/requirements.in
@@ -0,0 +1,31 @@
+Django==1.8
+#South==0.7.6
+ansicolors==1.0.2
+anyjson==0.3.3
+celerymon==1.0.3
+celery
+django-celery
+django-eml-email-backend==0.1
+django-extensions==0.9
+django-kombu
+django-picklefield==0.3.2
+pycrypto==2.6
+python-dateutil==1.5
+python-openid==2.2.5
+psycopg2==2.7.4
+PyICU==1.7
+django-pagination==1.0.7
+gmpy==1.17
+simplejson==3.4.0
+reportlab==3.0
+pyyaml
+
+# devtools
+selenium==2.25.0
+trunserver==0.0.2
+django-debug-toolbar==0.9.4
+ipython==0.13
+pytest==2.6.4
+pytest-cov==1.8.1
+pytest-xdist==1.11
+pytest-django==2.9.1
diff --git a/requirements.txt b/requirements.txt
index a0f13e1df..c773cc744 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,31 +1,56 @@
-Django==1.4
-South==0.7.6
+#
+# This file is autogenerated by pip-compile
+# To update, run:
+#
+#    pip-compile --output-file requirements.txt requirements.in
+#
+amqp==1.4.9               # via kombu
 ansicolors==1.0.2
 anyjson==0.3.3
-billiard==2.7.3.17
+apipkg==1.4               # via execnet
+attrs==17.4.0             # via automat
+automat==0.6.0            # via twisted
+backports-abc==0.5        # via tornado
+billiard==3.3.0.23        # via celery
+celery==3.1.25
 celerymon==1.0.3
-celery==2.5.3
-django-celery==2.5.5
+certifi==2018.1.18        # via tornado
+constantly==15.1.0        # via twisted
+cov-core==1.15.0          # via pytest-cov
+coverage==3.7.1           # via cov-core, pytest-cov
+django-celery==3.2.2
+django-debug-toolbar==0.9.4
 django-eml-email-backend==0.1
 django-extensions==0.9
 django-kombu==0.9.4
-kombu==2.4.7
+django-pagination==1.0.7
+django-picklefield==0.3.2
+django==1.8
+execnet==1.5.0            # via pytest-xdist
+gmpy==1.17
+hyperlink==18.0.0         # via twisted
+idna==2.6                 # via hyperlink
+incremental==17.5.0       # via twisted
+ipython==0.13
+kombu==3.0.37             # via celery
+psycopg2==2.7.4
+py==1.5.2                 # via pytest, pytest-cov, pytest-xdist
 pycrypto==2.6
+pyicu==2.0.3
+pytest-cov==1.8.1
+pytest-django==2.9.1
+pytest-xdist==1.11
+pytest==2.6.4
 python-dateutil==1.5
 python-openid==2.2.5
-psycopg2==2.5.2
-PyICU==1.7
-django-pagination==1.0.7
-gmpy==1.17
-simplejson==3.4.0
+pytz==2018.3              # via celery
+pyyaml==3.12
 reportlab==3.0
-
-# devtools
-#selenium==2.25.0
-#trunserver==0.0.2
-#django-debug-toolbar==0.9.4
-#ipython==0.13
-#pytest==2.6.4
-#pytest-cov==1.8.1
-#pytest-xdist==1.11
-#pytest-django==2.9.1
+selenium==2.25.0
+simplejson==3.4.0
+singledispatch==3.4.0.3   # via tornado
+six==1.11.0               # via automat, singledispatch
+tornado==4.5.3            # via celerymon
+trunserver==0.0.2
+twisted==17.9.0           # via trunserver
+zope.interface==4.4.3     # via twisted
diff --git a/settings.py b/settings.py
index 2c47b365a..5ae8dcb93 100644
--- a/settings.py
+++ b/settings.py
@@ -37,8 +37,8 @@ def get_from_env(var, default):
 
 # Language code for this installation. All choices can be found here:
 # http://www.i18nguy.com/unicode/language-identifiers.html
-LANGUAGE_CODE = 'el-gr'
-LANGUAGES = (('el', 'Greek'),)
+LANGUAGE_CODE = 'en'
+LANGUAGES = (('en', 'English'),)
 
 SITE_ID = 1
 
@@ -236,9 +236,11 @@ def get_from_env(var, default):
 
 ZEUS_VOTER_EMAIL_RATE = '30/m'
 
-ZEUS_ELECTION_LOG_DIR = os.path.join('/', 'usr', 'share', 'zeus', 'election_logs')
-ZEUS_RESULTS_PATH = os.path.join('/', 'usr', 'share', 'zeus')
-ZEUS_PROOFS_PATH = os.path.join('/', 'usr', 'share', 'zeus_proofs')
+DATA_PATH = os.path.join(ROOT_PATH, 'data')
+
+ZEUS_ELECTION_LOG_DIR = os.path.join(DATA_PATH, 'election_logs')
+ZEUS_RESULTS_PATH = os.path.join(DATA_PATH, 'zeus')
+ZEUS_PROOFS_PATH = os.path.join(DATA_PATH, 'zeus_proofs')
 ZEUS_ALLOW_EARLY_ELECTION_CLOSE = True
 ZEUS_CELERY_TEMPDIR = os.path.join('/', 'var', 'run', 'zeus-celery')
 ZEUS_HEADER_BG_URL = '/static/zeus/images/logo_bg_nobrand'
@@ -265,7 +267,7 @@ def get_from_env(var, default):
     'handlers': {
         'file': {
             'class': 'logging.FileHandler',
-            'filename': '/usr/share/zeus/zeus.log'
+            'filename': os.path.join(DATA_PATH, 'zeus.log')
         }
     }
 }
@@ -312,3 +314,8 @@ def get_from_env(var, default):
     from local_settings import *
 except ImportError:
     pass
+
+HELIOS_CRYPTOSYSTEM_PARAMS = {}
+HELIOS_CRYPTOSYSTEM_PARAMS['p'] = 19936216778566278769000253703181821530777724513886984297472278095277636456087690955868900309738872419217596317525891498128424073395840060513894962337598264322558055230566786268714502738012916669517912719860309819086261817093999047426105645828097562635912023767088410684153615689914052935698627462693772783508681806906452733153116119222181911280990397752728529137894709311659730447623090500459340155653968608895572426146788021409657502780399150625362771073012861137005134355305397837208305921803153308069591184864176876279550962831273252563865904505239163777934648725590326075580394712644972925907314817076990800469107L
+HELIOS_CRYPTOSYSTEM_PARAMS['q'] = 9968108389283139384500126851590910765388862256943492148736139047638818228043845477934450154869436209608798158762945749064212036697920030256947481168799132161279027615283393134357251369006458334758956359930154909543130908546999523713052822914048781317956011883544205342076807844957026467849313731346886391754340903453226366576558059611090955640495198876364264568947354655829865223811545250229670077826984304447786213073394010704828751390199575312681385536506430568502567177652698918604152960901576654034795592432088438139775481415636626281932952252619581888967324362795163037790197356322486462953657408538495400234553L
+HELIOS_CRYPTOSYSTEM_PARAMS['g'] = 19167066187022047436478413372880824313438678797887170030948364708695623454002582820938932961803261022277829853214287063757589819807116677650566996585535208649540448432196806454948132946013329765141883558367653598679571199251774119976449205171262636938096065535299103638890429717713646407483320109071252653916730386204380996827449178389044942428078669947938163252615751345293014449317883432900504074626873215717661648356281447274508124643639202368368971023489627632546277201661921395442643626191532112873763159722062406562807440086883536046720111922074921528340803081581395273135050422967787911879683841394288935013751L
diff --git a/setup-python b/setup-python
new file mode 100755
index 000000000..b10343c9d
--- /dev/null
+++ b/setup-python
@@ -0,0 +1,20 @@
+#!/bin/sh -e
+
+PYTHON=/usr/bin/python2.7
+
+if ! test -f "$PYTHON"; then
+    echo "$PYTHON not found."
+    exit 1
+fi
+
+if test -f env/bin/python && ! diff -q "$PYTHON" env/bin/python; then
+    echo "env/bin/python is different than $PYTHON, recreating virtualenv."
+    rm -rf env
+fi
+
+if ! test -f env/bin/python; then
+    virtualenv --python="$PYTHON" env
+fi
+
+. env/bin/activate && pip install pip-tools==1.11.0
+. env/bin/activate && pip-sync
diff --git a/zeus/results_report.py b/zeus/results_report.py
index a8a97fa38..eede14c5d 100644
--- a/zeus/results_report.py
+++ b/zeus/results_report.py
@@ -34,6 +34,7 @@ def _(x):
 
 PAGE_WIDTH, PAGE_HEIGHT = A4
 
+'''
 default_path = '/usr/share/fonts/truetype/linux-libertine/LinLibertine_Re.ttf'
 linlibertine = TTFont('LinLibertine',
 #                      '/Users/Panos/Library/Fonts/LinLibertine_Rah.ttf')
@@ -45,7 +46,7 @@ def _(x):
 #                       '/Users/Panos/Library/Fonts/LinLibertine_RBah.ttf')
                         getattr(settings, 'ZEUS_RESULTS_FONT_BOLD_PATH', default_path))
 pdfmetrics.registerFont(linlibertineb)
-
+'''
 ZEUS_LOGO = os.path.join(os.path.abspath(os.path.dirname(__file__)),
                          'logo-positive.jpg')
 
diff --git a/zeus/views/poll.py b/zeus/views/poll.py
index 9d052717e..7acc219af 100644
--- a/zeus/views/poll.py
+++ b/zeus/views/poll.py
@@ -20,7 +20,7 @@
 from django.utils.html import mark_safe, escape
 from django.shortcuts import redirect
 from django import forms
-from django.template.loader import Template, Context
+from django.template import Template, Context
 
 from zeus.forms import ElectionForm
 from zeus import auth