Fixed Bug - Play2.1 passes invalid 'rjs' option to TypescriptCompiler. Filter it out to avoid CLI errors.

This occurs when the "requireJs" option is specified in your projects build config

i.e.
val main = play.Project(appName, appVersion, appDependencies).settings(
    requireJs := Seq( "main.js" )
)
Merge pull request #15 from zoomzoom83/play-2.1

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