Update stata.cson

commenting and quoting improvements. 
quoting variables like `v' included.
Update stata.cson

+ Regression commands.
Update stata.cson

+ added foreach and mata coloring
Update stata.cson
Update stata.cson

+added list of keyword commands.
Update stata.cson
Merge pull request #2 from rhoconlinux/master

Update stata.cson [Pull request]