in its own context.  Files are separated by spaces, and will be run in order,
left to right.

Also add support for comment lines, which start with '#'.
Review URL: http://codereview.chromium.org/20319

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1306 ce2b1a6d-e550-0410-aec6-3dcde31c8c00