Adding karma test runner and some basic tests for topbar

This pull request adds support for the [Karma test runner](http://karma-runner.github.io/0.10/index.html).

I've added some basic tests for top bar to demonstrate the interaction with the [Jasmine test framework](http://pivotal.github.io/jasmine/).

I also modified the watch task to ensure copying of the normalize.css and various Foundation js libraries to the dist folder since the tests are looking for everything there.