Issue 3882: Coveralls.io Code Coverage Integration

Resolves issue: http://code.google.com/p/otwarchive/issues/detail?id=3882

Integrating Coveralls.io Code Coverage into our current Travis-CI process. This will tell us what our code coverage (how well our tests cover the code base) is, as well as how each pull request is going to affect that coverage. 


Step-by-Step install tutorial: https://coveralls.io/docs/ruby