Move all unit tests over from collections of self-executing functions to test cases using the new xUnit-style system.

As ease.js was originally written as a small collection of CommonJS modules with very little taken from Classical OOP, the testing was also fairly simple. Test cases were simply files with collections of self-executing functions, which served to separate individual tests within the case.

A small xUnit-style test case system and a suite runner have been developed for use in ease.js in order to provide better organization and useful output. The design is simple and will expand as is needed. The output has been modeled after my use of phpUnit. I am not interested in introducing a 3rd party testing framework, as I wish to keep the combine process for browser deployment fairly simple (that is: not change it around, at least at this time).