Test harness for visual and logical regression

[mduvall]

The code's getting to a point where a test automation framework will be useful in order to merge code at a higher cadence.

Catching logical regression should be fairly straightforward, could use either Jasmine or QUnit, no real preference.

This plugin needs to maintain visual consistency between major browsers (Safari, Chrome, and FF for now) and checking all these by hand is a bit taxing for innocuous fixes. Was thinking of a visual regression tool such as Huxley, PhantomCSS, or Wraith.

[mduvall]

QUnit was added for the logical regression suite, the visual regression framework is still TBD. Played around with the ones above and Huxley seemed the most straight forward to get set up.