Report coverage to coveralls.io

.coveragerc

+[report]
+include = apps/*
+omit =
+    **/__init__.py
+    **/tests/*
+    **/test/*

.travis.yml

@@ -8,8 +8,11 @@ install:
 before_script:
   - export DISPLAY=:99.0
   - sh -e /etc/init.d/xvfb start
+  - "pip install coveralls"
 script:
   - "python manage.py test"
   - "python manage.py harvest"
   - "npm test"
   - "python setup.py install"
+after_success:
+  coveralls

README.rst

 .. image:: https://travis-ci.org/edx/edx-tim.png?branch=master
     :alt: Travis build status
 
+.. image:: https://coveralls.io/repos/edx/edx-tim/badge.png
+  :target: https://coveralls.io/r/edx/edx-tim
+  :alt: Coverage badge
+
 This is an initial prototype for redesigning Peer Grading and general Open Ended
 Submission Evaluation. This project is in the early stages of development and is
 not ready for general use.