Port JavaScriptCompressor to new Rhino 1.7R3 AST API

Hi,

Since Rhino 1.7R3 release, there is a new AST API inside Rhino that allow to plug in any parser and should allow YUICompressor to be used without a modified Rhino parser.
I can count at least three issues linked to use of modified Rhino :
http://yuilibrary.com/projects/yuicompressor/ticket/2527981
http://yuilibrary.com/projects/yuicompressor/ticket/2528056
http://yuilibrary.com/projects/yuicompressor/ticket/1859529

So here it is a tentative patch to use directly rhino 1.7R3 instead of modified files.
Please send me any comments you have.

Regards,
--
Damien Raude-Morvan