Rewrite IETF ID URLs to Tools or Datatracker

Rewrite IETF ID URLs (www.ietf.org/id/foo-00.txt) to the Tools (or Datatracker) versions.

This will rewrite the "official" IETF Internet Draft URLs (http://www.ietf.org/id/foo-42.txt) to the Tools (http://tools.ietf.org/html/foo-42) or Datatracker (http://datatracker.ietf.org/docs/foo) versions instead. This uses Google Analytics to track how many folk install / use the extension (so I know if it is worth putting time into updating it, etc. If this offends you, let me know and I'll send you a version without the tracking stuff). Version log: 1.0.4.0: -- Added checkbox to redirect to SSL sites (enabled by default) -- Code cleanup. 1.0.3.1: -- Fixed option saving issue (Content-Security-Policy was not allowing inline event. Moved options code to its own file (options.js)) -- Updated to use Version 2 manifests. -- Update with patch from Barry Leiba to handle https and "rfc-editor.org"