Add Travis CI (#1)

* Add Travis CI

* Use requirements.txt, fix both error

Use requirements.txt instead of common-requirements.txt
Fix error by setting boto config to /dev/null per
travis-ci/travis-ci#7940

* Set postgres version on Travis

By default Travis uses Postgres 9.2, which doesn't support the JSONB
type that we need.

.travis.yml

@@ -0,0 +1,34 @@
+language: python
+# Test against 2.7
+python:
+  - "2.7"
+cache:
+  directories:
+    - $HOME/.cache/pip
+addons:
+  postgresql: "9.4"
+services:
+  - postgresql
+env:
+  PIP_DOWNLOAD_CACHE=$HOME/.cache/pip
+  DATABASE_URL=pgsql://postgres:@localhost:5432/everyvoter
+  CACHE_URL=dummycache://
+  SECRET_KEY=demo_secret_key
+  GEOCODIO_KEY=DEMO
+  CELERY_ALWAYS_EAGER=True
+before_install:
+   - pip install --upgrade pip
+install:
+  - pip install -r requirements.txt
+# command to run tests
+script:
+# Fix for boto error on Travis
+  - export BOTO_CONFIG=/dev/null
+  - python manage.py test
+# install and run pylint if everything passed
+after_success:
+  - pip install pylint==1.5.2
+  - pylint --rcfile=.pylintrc accounts everyvoter_common election branding api user_import rendering geodataset hirefire staff
+# turn off email notifications
+notifications:
+  email: false