allow access to value stack - fixes #168
don't alter variables that look like semantic values but aren't -- fixes #162
0.4.10
YYABORT and YYACCEPT
support %parse-param declarations - fixes #131
Switched shift() to pop() in token stack for speed
Merge branch 'master' of https://github.com/zaach/jison

Conflicts:
	tests/parser/actions.js