moved valid extensions down to the engine level so engines can be built allowing jpg, gif, etc
updated documentation
added sprites folder
updated core git ignore
created sprites gemspec
move over sprite tests
WIP refactoring tests to use def test
convert to test unit format
WIP tests
move test helpers
move test helpers WIP
WIP
moved regression test and speed up call back test by ~4seconds
upgraded mocha
finished decomposing test helpers
added diff
finished test helper decompose
update tests to incude the correct modules
prep for moving over actual sprite code
test pass importer moved over