no change to spritesheet, but adding docs and new importer

1) added a simple REAME.md to help new users get up and running.
2) added Example folder with the tutorial example Fugocode put together.  It's credits the author and the artist.
3) added a TexturePackerImporter that used Regex to auto match files paths to behaviors.
 +  Added example for this importer as well and added readme.
 +  Includes testing
 +  added files used in openfl-validator to run unit test in OpenFL

There are 5 commits so that you can cherry-pick what you want.  Please let me know if you have any feedback or requests.

Cheers,
Hays