Added gotoAndStop to BitmapAnimation in easeljs.d.ts and declare to module

Added the gotoAndStop method that is available in easeljs-0.6.1 and also included the "declare" before "module createjs" which allows it to be used with TypeScript 0.9
Merge pull request #606 from studiollama/patch-1

Added gotoAndStop to BitmapAnimation in easeljs.d.ts and declare to modu...