Update lexer to recognize JS regex literals

The parsing code was failing in enyo.Control due to some
embedded regex's we added.  This prevents that failure
by having the lexer properly recognize those as their
own tokens.

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #34 from enyojs/lex-regexps

Update lexer to recognize JS regex literals