notify: send changesets on 'outgoing' hook, updated doc

sslutil: Restore missing imports of socket and httplib to sslutil Two imports were omitted in the restructure of the code creating sslutil.py, socket and httplib are required when the 'ssl' module cannot be imported, restoring these imports allows mercurial to run on python2.4+2.5.

dispatch: assign I/O descriptors from the request to the ui