add coverage

.coveragerc

@@ -0,0 +1,9 @@
+[run]
+omit = */urls/*
+       */__init__.py
+       */tests.py
+       */migrations/*
+       *urls.py
+       /usr/local/lib/*
+       /usr/lib/*
+       utils/xss_filter.py

.travis.yml

@@ -10,4 +10,5 @@ install:
     - python manage.py initadmin
 script:
     - flake8 .
-    - python manage.py test
+    - coverage run manage.py test
+    - coverage report

deploy/requirements.txt

@@ -5,3 +5,4 @@ jsonfield
 otpauth
 flake8-quotes
 pytz
+coverage