Add directory feature button

This MR adds the "Add directory" feature as described in #2557 and splits out the "Create file" and "Upload file" in a dropdown.

### Screenshots

![image](https://gitlab.com/gitlab-org/gitlab-ce/uploads/098b77026508eef222e0f93ec78f34ec/image.png)

![image](https://gitlab.com/gitlab-org/gitlab-ce/uploads/93588b0280ffa2bd44603193feac5bdf/image.png)

![image](https://gitlab.com/gitlab-org/gitlab-ce/uploads/9094a63d41d7cb33e103390545c9c146/image.png)

Added branch capability to upload file form:

![image](https://gitlab.com/gitlab-org/gitlab-ce/uploads/9b3c012a3f2333a5db0e2ceb8e6711ec/image.png)

"Upload file" is no longer accessible from the "Create file" page. Users can now select a target branch in upload file as well.
   
Closes #2799: Fixes a bug where file modes were overwritten after a commit
    
Closes https://github.com/gitlabhq/gitlabhq/issues/8253: Existing files can no longer be overwritten in the "Create file" section.
    
Closes #2557 

See merge request !1453

Change "+" icon under "Files" section to have three options:

* Create file
* Upload file
* New directory

Upload file is no longer accessible from the "Create file" page.
Users can now select a target branch in upload file as well.

Closes #2799: Fixes a bug where file modes were overwritten after a commit

Closes https://github.com/gitlabhq/gitlabhq/issues/8253: Existing files
can no longer be overwritten in the "Create file" section.

Closes #2557

Move CI build page to CE project

* move CI build page to project 
* cleanup unused code
* fix few 500 errors (build cancel and few CI admin pages)
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !1524

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Render CI statuses on commit page

This MR merges CI commit page into CE commit page.
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !1519

Fix search in Files

https://gitlab.com/gitlab-org/gitlab-ce/issues/1873

See merge request !1511

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Fix CI regressions introduced by ci_commit changes

/cc @dzaporozhets 

See merge request !1518

Use CI commit status for merge request widget

For temporary compatibility with other services like Jenkins we ask for
CI status via AJAX request if there is no commit status in GitLab
database
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>


cc @ayufan 

See merge request !1517

For temporary compatibility with other services like Jenkins we ask for
CI status via AJAX request if there is no commit status in GitLab
database
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Remove tmp/.gitkeep

This file is obsolete since 5b4aba5f as it exists
solely for the directory to exist.

See merge request !1506

[ci skip]

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Merge branch 'user-preferences-layout-option' of https://github.com/gopeter/gitlabhq into gopeter-user-preferences-layout-option
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !1512

Refactor Ci::Commit and Ci::Build to have all builds for same :sha on single page

This makes Ci::Commit to have only :sha and simplifies routing to have only :sha in path. The :ref and :push_data is now parameter of Ci::Build.

All commit related data (git author, message and .gitlab-ci.yml) is read directly from repository.

All code related for creating builds is moved to CreateBuildsService.

Status deduction is rewritten to make if more efficient and easier to integrate with Commit Status API.

This is partially working, tests are not yet touched.

This slightly changes view of Commit:
![Screen_Shot_2015-10-02_at_15.21.47](https://gitlab.com/gitlab-org/gitlab-ce/uploads/ad3f1ccdcc87659ea437d8db6c5b9f94/Screen_Shot_2015-10-02_at_15.21.47.png)

@dzaporozhets What do you think?


See merge request !1502

Fix referals for :back and relative URL installs.

`app/views/layouts/_head.html.haml` currently sets the referrer policy to "origin". This disables the use of `{ redirect_to :back }`, which is used frequently throughout GitLab, and also breaks relative URL installs for browsers that obey this policy (e.g., Chrome).

For example, using the "origin" policy the "Save Changes" button on the profile screen will (a) dump you at the GitLab home screen (which I can confirm on GitLab.com) or (b) dump you out of GitLab entirely for a relative URL install (which I can confirm on my local install).

The right policy is "origin-when-cross-origin", which disables HTTP_REFERER when coming from other sites but enables it internally. (https://w3c.github.io/webappsec-referrer-policy/) I can confirm that this fixes the problems with ":back" on my install.

See merge request !1505

This option only existed to ease the CI-to-CE/EE migration process.

This commit partially reverts 8b05abe8

Document known issue with Reply by email and multiple application servers.

See merge request !1499

Revert "Merge branch 'projects' into 'master'"

This reverts commit 2b493695, reversing
changes made to b5c12f74.

This reverts !1487 MR because it cause bugs on mobile devices 


cc @skyruler 

See merge request !1509

This ensures that blocks defines using "benchmark_subject" have access
to methods defined using let/subject & friends.