Update windows installer setup files

Updated path to `installer.ps1` file to respect new toolset dir.

Updated `installer.ps1` to install the `Chocolatey` package manager,
install Scala, install latest JDK, and Play 2.2.
Added Windows support for `play-scala`
Updated play-scala setup for Windows

Updated the play-scala setup.py file to work with Windows (i.e. call
`play.bat`).

Fixed issues with the `stop()` method [Play2 no longer supports the
`stop` command].
Merge pull request #493 from kppullin/play-scala-windows

Support `play-scala` on Windows