Use codecov.io for coverage tracking.

Coveralls doesn't support branch coverage, while codecov does.

.travis.yml

@@ -18,18 +18,13 @@ install:
   - "pip install ."
   - "pip install .[ical]"
   - "pip install .[test]"
-  - "pip install coveralls"
+  - "pip install codecov"
 script:
   - "green -vvr"
   - "python -m pylint --errors-only topydo test"
 # Cache Dependencies
 after_script:
-- if [[ $TRAVIS_PYTHON_VERSION == 3.4 ]]; then
-          coveralls;
-  fi
-- if [[ $TRAVIS_PYTHON_VERSION == 2.7 ]]; then
-          coveralls;
-  fi
+  - codecov
 cache:
   directories:
     - $HOME/travis/.cache/pip

README.md

 topydo
 ======
 
-[![Build Status](https://travis-ci.org/bram85/topydo.svg?branch=master)](https://travis-ci.org/bram85/topydo) [![Coverage Status](https://coveralls.io/repos/bram85/topydo/badge.svg?branch=master&service=github)](https://coveralls.io/github/bram85/topydo?branch=master) [![Join the chat at https://gitter.im/bram85/topydo](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/bram85/topydo?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [![Flattr this git repo](http://api.flattr.com/button/flattr-badge-large.png)](https://flattr.com/submit/auto?user_id=bram85&url=https://github.com/bram85/topydo&title=topydo&language=&tags=github&category=software) 
+[![Build Status](https://travis-ci.org/bram85/topydo.svg?branch=master)](https://travis-ci.org/bram85/topydo) [![codecov.io](https://codecov.io/github/bram85/topydo/coverage.svg?branch=master)](https://codecov.io/github/bram85/topydo?branch=master) [![Join the chat at https://gitter.im/bram85/topydo](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/bram85/topydo?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [![Flattr this git repo](http://api.flattr.com/button/flattr-badge-large.png)](https://flattr.com/submit/auto?user_id=bram85&url=https://github.com/bram85/topydo&title=topydo&language=&tags=github&category=software) 
 
 topydo is a todo list application using the [todo.txt format][1]. It is heavily
 inspired by the [todo.txt CLI][2] by Gina Trapani. This tool is actually a