skinny 1.3.4 (new formula)

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.
I think otherwise. The _global_ here just means that `yo` command using libexec/lib/mode_modules is included in PATH.

Installing global `yo` command is the Yeoman's standard way. Our `skinny` script (which can work without homebrew installation) expects `yo` command in the PATH. https://github.com/skinny-framework/skinny-framework/blob/1.3.4/yeoman-generator-skinny/app/templates/skinny#L95