Make 'traceur' cleanup process.argv and setup the node.js module so that relative require works.

BUG=https://code.google.com/p/traceur-compiler/issues/detail?id=226

Review URL: https://codereview.appspot.com/7552046
Patch from Eduard Burtescu <edy.burt@gmail.com>.
Interpreter: Fix issue where require does not resolve correctly.

https://github.com/google/traceur-compiler/issues/224
Merge pull request #226 from arv/interpreter-fix-module-filename

Interpreter: Fix issue where require does not resolve correctly.