Added failing unit tests to check travis is working correctly.
Using travis' built in xctool to run tests on travis-ci.com
Removed any code signing settings.
Added code signing back in.
Using explicit xctool command when running on travis.
Added travis build coverage badge to README.
Removed failing unit tests.
Added Coveralls code coverage config file.

More info here https://coveralls.io
Code coverage computed based on the travis-ci test results.
Added ONLY_ACTIVE_ARCH=NO to travis-test.
Added Coveralls code coverage badge.
Merge pull request #26 from 3squared/travis-test

Travis and Coveralls setup.