Feature multiple ldap servers

Update the code so Gitlab-EE can support multiple LDAP servers

See merge request !1172

Libravatar documentation

Fixes #1248

See merge request !1173

Notification level note

Fixes #1406

![Screenshot 2014-10-14 12.28.40](https://dev.gitlab.org/uploads/gitlab/gitlabhq/e2aef0a8d6/Screenshot_2014-10-14_12.28.40.png)

See merge request !1174

And add some advertisement to use GitLab EE

update changelog

Change log entry for https://github.com/gitlabhq/gitlabhq/pull/8020

Make new and edit file submit more uniform

Conflicts:
	app/controllers/omniauth_callbacks_controller.rb

Sorting users in admin

See merge request !1170

Feature oauth refactoring

same MR as gitlab/gitlab-ee!188

See merge request !1169

These changes are ported from EE to CE. Apply changes for app directory

Improve event note display in dashboard and project activity views

minor updates to mysql cleanup

Improve event note display in dashboard and project activity views

* take -> make
* correct incorrect details about when pool size was changed

simplify schema.rb reset in upgrade guides

Cleanup MySQL database

Update the `#first_line_in_markdown` method so that the first line of
parsed text is displayed more reliably, and the continuation indicators
("...") are displayed in all cases where the note is truncated.

Also add Rspec tests for `EventsHelper#event_note`.