Add coverage stats

.travis.yml

@@ -1,15 +1,20 @@
 language: python
+addons:
+  postgresql: "9.4"
 services:
   - postgresql
 python:
   - "3.4"
   - "3.5"
 install:
   - pip install -r requirements.txt
+  - pip install coveralls
 script:
   - cd pets
-  - python manage.py test
+  - coverage run manage.py test
 env:
   - DJANGO_SETTINGS_MODULE=pets.settings.dev DB_NAME=test DB_USERNAME=test DB_PASSWORD=test DB_IP=127.0.0.1 DB_PORT=5432 DB_ENGINE=django.db.backends.postgresql_psycopg2 DB_CONN_MAX_AGE=0 SECRET_KEY=dummy_key ALLOWED_HOSTS=127.0.0.1, .localhost EMAIL_PORT=0 EMAIL_HOST=example.com EMAIL_HOST_PASSWORD=example EMAIL_HOST_USER=dummy@example.com OPBEAT_DISABLE_SEND=true
 before_script:
   - psql -U postgres -c "CREATE USER test WITH CREATEDB PASSWORD 'test';"
+after_success:
+  - coveralls