Remove our manual submodule stuff

Per the below links the git module itself
supports getting git submodules recursvily.

* https://github.com/ansible/ansible/pull/3292/files
* https://github.com/ansible/ansible/issues/3291
* https://groups.google.com/forum/#!topic/ansible-project/L2QJadpZNE8

Thus we can remove this task and everything should
still function as expected

NOTE: Suggested action
- Keep this in a branch and make prod2 pull from said branch
- Update mediawiki-core and see if it is upd on prod2
- Update an extension we have branched and see if prod2 upds
- If the above work then we can deploy this change

Further Note:
Currently the state of mediawiki-core causes conflicts on prod2
and the prod2 copy of mediawiki-core is always in a touched and
dirty state. We should fix this..
Remove our own mediawiki change detection

Per the sobmodule updating issue this should
now work as expected
Fix IRC handler name
Merge pull request #151 from Orain/removeextupd

Remove extra extension update