Fix lint and allow null keyword
Fix lint and allow null keyword

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