Added coverage to nosetests.

Added
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* Added coverage to be used with coveralls when running nosetests.
* New .travis folder to hold scripts used when building with Travis-CI.
Added missing semicolon.
Removed numpydoc requirement for unittests.
Added coveralls badge.
Added Travis-CI badge.
Install coverage module.
Install coverage module into virtual env.
Merge pull request #53 from mcflugen/add-coveralls-support

Track code coverage of unit tests and hook into the coveralls web service.