Remove success signin message by devise

I find it really annoying every time I login into GitLab it shows me
that I successfully signed in. But this makes no sense to me. I already
see dashboard and dont see login screen. Its obvious I signed in
successfully. Instead it just show annyoing message every time taking
part of space on my screen.

See merge request !401

You get redirected after signuout to gitlab.com and see this message on login page which makes no sense.

I find it really annoying every time I login into GitLab it shows me
that I successfully signed in. But this makes no sense to me. I already
see dashboard and dont see login screen. Its obvious I signed in
successfully. Instead it just show annyoing message every time taking
part of space on my screen.

Improve UI

* Improve group rename warning
* Refactor select css. Make selects same width

See merge request !400

Improve diffs UI

* replace big button with simple toggle for diff comments
* replace diff stats button with link

See merge request !399

Handle nil restricted visibility settings

Return `true` from `non_restricted_level?` when the `restricted_visibility_levels` setting is nil.  This addresses #2154.

cc @sytse

See merge request !1724

Added binstub for guard

Return `true` from `non_restricted_level?` when the
`restricted_visibility_levels` setting is nil.

This reverts commit 7602cef5.

Signed-off-by: Jeroen van Baarsen <jeroenvanbaarsen@gmail.com>

Fix condensed range in MR push comment.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/1246

In https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/326#note_984907, you see that the compare page doesn't actually have 39 commits because we're using `first_new_commit^`, which is not always the same as `oldrev`. With this MR, we use `oldrev` instead, which will always work.

See merge request !1721

Api: sort merge_request comments

Add default_scope { order(created_at: :asc, id: :asc) } in Note so comments are sorted when fetched through api.

See merge request !256

Add changelog, license and contribution guide links to project sidebar.

If the version is known, the "Version: 7.9.0pre" button links to the changelog, otherwise a "View changelog" button is shown.

![Screen_Shot_2015-03-18_at_14.22.29](https://dev.gitlab.org/gitlab/gitlabhq/uploads/747acc018ec9a188098e0f0bc4e91cc3/Screen_Shot_2015-03-18_at_14.22.29.png)

See merge request !1708

Bump gitlab_git to 7.1.2

For https://dev.gitlab.org/gitlab/gitlabhq/issues/2151

See merge request !1722

List new commits for newly pushed branch in activity view.

When someone pushes commits, I want to see them, regardless if it's a new or existing branch. If it's a new branch, we compare with the default branch (usually master).

![Screen_Shot_2015-03-17_at_15.49.13](https://dev.gitlab.org/gitlab/gitlabhq/uploads/4cb7e0d833bc83a30197db81d4b273bc/Screen_Shot_2015-03-17_at_15.49.13.png)

See merge request !1711

Fix the order of signin and signup on features page.

See merge request !1720