Increase maximum number of redirects in line with modern browsers.

Modern browser mostly limit re-directs to 20.
The current limit in PhantomJS is 10 which is not in line with most browsers.

This patch is a simple increase of gMaxRedirections from 10 to 20.

http://code.google.com/p/phantomjs/issues/detail?id=849

Change-Id: Ifea39cdd61bde4f19a772cab78197c6e45add36c
Enable remote debugging.

This is just applying enable_debugger.patch.
See also https://github.com/ariya/phantomjs/pull/173.

http://code.google.com/p/phantomjs/issues/detail?id=6

Change-Id: I9bdd74b97d21ec4fcc7277ebd37136c241efc5ff