Add Base for Unit Testing

Trying to at least put in a model that will allow people to add unit tests in the future (adding a bunch of unit tests might be better for a future commit).

I used FlexUnit here as this seems to be the standard (it's built into FlashBuilder and is open source: https://github.com/flexunit/flexunit)

I also added a script (test.sh) that should compile and open the swf to show pass/fails.  I'll add to the contributing.md and readme.md once those files have been merged to master with changes.