skinny 1.3.4 (new formula proposal)

This is new formula proposal. Skinny Framework is a famous web framework in Scala.
http://skinny-framework.org/
We already supports homebrew installation from our alternative repository for months past.
https://github.com/skinny-framework/homebrew-alt

Thank you in advance.
Wait a sec, missed this earlier: why is this writing it's own version of npm? Can't you just run `npm` without `-g` below to install into the prefix?