Closes #745

Closes #1724

Steps to reproduce:
1. Create a project with a README
2. In the actual remote, type: `git symbolic-ref HEAD refs/heads/nowhere`
3. Check that HEAD is gone via `git ls-remote .`
4. Go to the projects page and see the Error 500

Closes https://github.com/gitlabhq/gitlabhq/issues/9484

Starting with migration `20150717130904` commit count is stored in the
database. For existing projects it defaults to `0` and is updated to the
correct value when commits are pushed.

The newly introduced rake task updates the commit count for all projects
which have not been updated yet.

Refs !986, !989, #2040.

On the first load, the merge request tabs would be requested in JSON format to render
the HTML. This would cause the "Reload with full diff" button to create a link to diff.json.

Closes #2041

Closes #1362

ZenMode is now initialized for snippet pages.

Fixes #2036.

The change log for 7.11 was accidentally split in
3865a1d9. Additionally, the change added
with this commit did not make it into 7.11 according to
`git branch --contains` and it has not been cherry picked to 7-11-stable
so the entry is moved to 7.12.

Refs GH-5625, GH-9318.

[ci skip]

Unauthenticated users had access to disabled features of public
projects. The code has been slightly refactored so that feature checks
are done in a separate method and can also be applied for public access.

Recalculating graph_log took minutes on a large repository since each
of the 6000 commits would need to calculate the diff. Since graph_log
does not appear to be used, remove it from the list of things to update.
For the Linux kernel repository, this reduced the ProjectCacheWorker time
from 8+ minutes to 16 seconds.

Closes #2016

The label page was added to navigation for unauthorized users because
the previously used milestone read permission was still checked. This
has been fixed and read access to labels is now granted (again) for
public projects.

This regression has been introduced in
07efb17e (7.12).

See also 9bcd3639.

Refs !836, !842.

Closes #1612

Closes #1967

This fixes the file upload dialog which currently works for new comments
but not for comment editing. The cause for this is a missing DOM class
which causes traversal to the dropzone to fail.

This is fixed by adding the expected `gfm-form` class to the edit form.
It has to be added dynamically since adding it to the form template
would break the form's layout and comment saving.

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

Closes https://github.com/gitlabhq/gitlabhq/issues/1504

Closes #1832

This should help prevent endless Redis growth.

Closes https://github.com/gitlabhq/gitlabhq/issues/9449

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

Closes #1955

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

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