added unit test, definitions export, tuned project

added tests
- added test for module shape and first stage test
- added grunt-mocha-slimer devDependency
- added mocha, chai, node typings

exporting definitions
- added grunt-dts-bundle devDependency
- added .d.ts to typescript element in package.json

moved IRenderer to types

added transparent Stage support
added clear-with-alpha support
added transparency helper to color util

added supportsWebGL method to main export