Fixed Bug - Play2.1 passes invalid 'rjs' option to TypescriptCompiler.

Play2.1 passes the option 'rjs' to TypescriptCompiler. Here's a patch to filter it out to avoid CLI errors.

This occurs only when the "requireJs" option is specified in your projects build config, and only during debug mode (`play run`) - otherwise it works correctly.

i.e.
val main = play.Project(appName, appVersion, appDependencies).settings(
    requireJs := Seq( "main.js" )
)