Merge branch 'master' into non-interactive-aws-install

Conflicts:
	doc/installation.md

Fix merge mess in installation.md

Simplified gitolite handle logic
Stubn over monkeypatch
Stub only specific methods in Gitlab:Gitolite
Moved grach auth to lib
added specs for keys observer
removes SshKey role

New config option: git_hooks_path

Closes #1237

of 'gitlab.yml'.

gitlabhq\config\initializers\1_settings.rb looks for
'gitolite_admin_uri' in the 'git' section of 'gitlab.yml'

Actually, that setting is in the 'git_host' section.
If not fixed, the 'gitolite_admin_uri' would always be equals to
'git@localhost:gitolite-admin', even if the administrator wants
to have another user than 'git' in charge of that repo.

* .page_title  class added. Used for better page headers
* improved help page
* added back links for help pages
* show app version & revision on help page

Backend changes:
* Gitab::Version && Gitlab::Revision constants

Renamed protect_resque.rb => resque_authentication
Integrated resque web with the rest of gitlab