Add better expression support

... covers expressions inside argument defaults, also introduces some explicit knowledge of grouping literals
woops - forgot to deal with comments in hash-likes
Added windows platform build cmd

Added windows platform build cmd per http://docs.sublimetext.info/en/latest/reference/build_systems.html
Removed opinionated path

Ruby should be in your path, I shouldn't specify my version.
Updated Readme

Borrowed a bunch from https://github.com/stopdropandrew/SublimeLinter-puppet/ README
Create Authors
linked puppet url
Update README

Closes #4 #5