Show the relation between Merge Requests and Mileston in different
places:
- Merge Request page
- Milestone list page
- Milestone details page

Step 1:
* Add milestone_id in the model for merge_requests
* Make it possible to create or update a Merge Request with an attached
  Milestone detail
* Add the possibility to filter by Milestone and / or Assignee in the
  Merge Requests listing page

grack auth bugfix: allow dots in reponame

Some grammatical improvements

Nothing too dramatic, just some improvements.

Api for merge request

Refer developers to the vagrant vm and remove out of date documentation.

Fix broken Note scopes with lambdas, 4.0 compat

Without lambdas, Date.today will be evaluated in the class body.
For it to have a running scope of last week etc, it will need to
be evaluated each time the scope is called.
In Rails 4.0, lambdas will be required for all scopes, so not a bad
idea to go ahead and change them all now.

Added autofocus for issue title

Git Smart HTTP protocol runs on `gitlab:gitlab`.