Adds Karma config file and tests Travis CI.

-Replaces previous commit:

Fixes #24  
-Typing gulp karma in the terminal will run and pass the three tests in testingExample.
-Added Travis CI - wasn't sure how to test it before submitting it, so we'll see...I followed the instructions as per the documentation to see exactly what it does (if it works, fixes issue 13).

Got Travis working. Fixes #13