revert changes to tsbuild.ts
revert changes to tsbuild.ts

donaldpipowitch/TypeScript,SaschaNaz/TypeScript,weswigham/TypeScript,alexeagle/TypeScript,kitsonk/TypeScript,alexeagle/TypeScript,microsoft/TypeScript,alexeagle/TypeScript,donaldpipowitch/TypeScript,weswigham/TypeScript,minestarks/TypeScript,nojvek/TypeScript,minestarks/TypeScript,kpreisser/TypeScript,kpreisser/TypeScript,Microsoft/TypeScript,kpreisser/TypeScript,nojvek/TypeScript,nojvek/TypeScript,SaschaNaz/TypeScript,RyanCavanaugh/TypeScript,microsoft/TypeScript,RyanCavanaugh/TypeScript,kitsonk/TypeScript,Microsoft/TypeScript,donaldpipowitch/TypeScript,donaldpipowitch/TypeScript,minestarks/TypeScript,RyanCavanaugh/TypeScript,kitsonk/TypeScript,nojvek/TypeScript,SaschaNaz/TypeScript,weswigham/TypeScript,SaschaNaz/TypeScript,Microsoft/TypeScript,microsoft/TypeScript