Cygwin/mingw support

Cygwin and MinGW give the error when starting play command. This fixes it:

    Error during sbt execution: Could not find configuration file 'c:/utils/play/framework/sbt/sbt.boot.properties'.  Searched:
        file:/c:/projects/project-name/
        file:/C:/Users/jaap_000/
        file:/C:/utils/play/framework/sbt/