Remove access control for uploaded images to fix broken images in emails

Replaces !530.

> This MR removes the access control for uploaded images. This is needed to display the images in emails again.
>
> The previous solution to base64 encode the images had to be reverted, because not all email clients supported it.
>
> If possible this should go into the 7.10 release.

See merge request !533

Ignore submodules that are defined in .gitmodules but are checked in as directories.

Pulls in gitlab_git 7.1.10 which contains gitlab-org/gitlab_git!26.

Fixes #1439 and https://github.com/gitlabhq/gitlabhq/issues/9140

See merge request !540

Fixed typo in deploy html

do not prepend relative_url_root to avatar

Parse GFM references after sanitizing

Parse GFM references - labels, issues, MRs, etc. - after calling the HTML Pipeline `SanitizationFilter` so that we can use non-whitelisted attributes like `style`.  See #2188.

See merge request !1745

Fix label color input.

Because `value` was set, every label color would render as purple in the form.

Introduced by 83b5a9ae between 7.9 and 7.10, so no changelog item.

See merge request !538

The commit.author.icon variable contains a full URL, which gets broken
when prepended by the relative_url_root setting (generating hrefs like
"/gitlabhttps://...".

Let Bootstrap's tab JS handle history

Closes #2219

See merge request !1784

Revert and re-fix image rendering in help pages

Closes #2212

See merge request !1765

Extract and re-insert links after sanitizing user markup.

Add the text "Add your ssh key to an application" with link to http://wiki.eclip…

…se.org/EGit/User_Guide#Eclipse_SSH_Configuration

Add text "Add your ssh key to an application" with link to http://wiki.eclipse.org/EGit/User_Guide#Eclipse_SSH_Configuration
Add on document http://doc.gitlab.com/ce/ssh/README.html

Reference:
https://twitter.com/elraro21/status/585146770709151747

See merge request !1774

Closes #2219

Fix Resource Owner Password Authentication Flow

Add Google Code importer to changelog.

cc @dzaporozhets

See merge request !537

Decrease memory use and increase performance of Google Code importer.

Addresses private issue https://dev.gitlab.org/gitlab/gitlabhq/issues/2241.

See merge request !536

Update gitlab_git to ignore invalid lines in .gitmodules.

Pulls in gitlab_git 7.1.9 which contains https://gitlab.com/gitlab-org/gitlab_git/merge_requests/24

Closes #1412, https://github.com/gitlabhq/gitlabhq/issues/8135 and https://github.com/gitlabhq/gitlabhq/issues/8881

See merge request !535

Fix username period migration to preserve uniqueness of names and paths.

See merge request !534

Add new rake task to check repo integrity

Add a `gitlab:repo:check` task that checks repository integrity with `git fsck`.  See #1819.

See merge request !1778

Fix auto-selection of URL field with X11 selection

We use `focusin` event instead of `click` because when using the latter,
when the selection is created it isn't put into X11 PRIMARY selection.
And as a Linux user I'm very used to such behaviour that when something
gets selected, it's ready for pasting, which is the primary purpose of
the clone URL field.

When `focusin` is used, the selection is copied to X11 buffer
automatically, so it works as expected (tested in Firefox and Chrome).