Add spec to RelativeLinkFilter for Unicode filenames

Adds specs for changes added in !1050

See merge request !1078

Prepare Markdown feature spec for testing multiple pipelines

This MR lays the groundwork for including or excluding certain HTML::Pipeline
filters depending on what we're parsing. For example, excluding reference
filters in the Issues and Merge Requests titles.

See merge request !1053

Add project star and fork count, group avatar URL and user/group web URL attributes to API

Addresses internal https://dev.gitlab.org/gitlab/gitlabhq/issues/2521.

See merge request !1058

Update RelativeLinkFilter to support non-ASCII filenames

See merge request !1050

Backup directory permissions

This sidesteps problems with running 'chmod' on some CIFS mounts.

Closes #1704 
https://gitlab.com/gitlab-org/gitlab-ce/issues/1704

See merge request !1065

Check that hooks directory exists before attempting to call realpath

This MR checks that the hooks directories actually exist before attempting to resolve their `realpath`.

Users who attempted to restore from source to an omnibus installation would get ugly errors when running `gitlab-rake gitlab:check`:

```
Errno::ENOENT: No such file or directory @ realpath_rec - /var/opt/gitlab/git-data/repositories/Wanda/www.git/hooks
/opt/gitlab/embedded/service/gitlab-rails/lib/tasks/gitlab/check.rake:488:in `realpath'
/opt/gitlab/embedded/service/gitlab-rails/lib/tasks/gitlab/check.rake:488:in `block in check_repos_hooks_directory_is_link'
/opt/gitlab/embedded/service/gem/ruby/2.1.0/gems/activerecord-4.1.11/lib/active_record/relation/batches.rb:52:in `block (2 levels) in find_each'
/opt/gitlab/embedded/service/gem/ruby/2.1.0/gems/activerecord-4.1.11/lib/active_record/relation/batches.rb:52:in `each'
/opt/gitlab/embedded/service/gem/ruby/2.1.0/gems/activerecord-4.1.11/lib/active_record/relation/batches.rb:52:in `block in find_each'
/opt/gitlab/embedded/service/gem/ruby/2.1.0/gems/activerecord-4.1.11/lib/active_record/relation/batches.rb:126:in `find_in_batches'
/opt/gitlab/embedded/service/gem/ruby/2.1.0/gems/activerecord-4.1.11/lib/active_record/relation/batches.rb:51:in `find_each'
/opt/gitlab/embedded/service/gem/ruby/2.1.0/gems/activerecord-4.1.11/lib/active_record/querying.rb:9:in `find_each'
/opt/gitlab/embedded/service/gitlab-rails/lib/tasks/gitlab/check.rake:482:in `check_repos_hooks_directory_is_link'
/opt/gitlab/embedded/service/gitlab-rails/lib/tasks/gitlab/check.rake:343:in `block (3 levels) in <top (required)>'
Tasks: TOP => gitlab:check => gitlab:gitlab_shell:check
```

Closes #2121

#2082

See merge request !1068

Closes #2121

Fix network graph when branch name has single quotes

## Steps to reproduce

1. Create a branch with a single quote in the branch name: "`test`"
2. Look at Project's Network view

Closes https://github.com/gitlabhq/gitlabhq/issues/9500

See merge request !1063

Switched the order of the SSH key form

Now it looks like this:

![image](https://gitlab.com/gitlab-org/gitlab-ce/uploads/dca3353266e93cec9cfd9f2f16af8657/image.png)


See merge request !1069

Check that project was actually created rather than just validated in import:repos task

Add gitlab-shell to error message to give user a clue that something may be wrong there.

Ran into this in #2082. User was told that repositories were created when they were
not due to `hooks` symlink being wrong.

See merge request !1039

Minor styling fixes

- Link to rendered html instead of markdown source.
- Removed typos

See merge request !1044

Closes https://github.com/gitlabhq/gitlabhq/issues/9500

Updated Twitter OmniAuth documentation

See merge request !1071

Add gitlab-shell to error message to give user a clue that something may be wrong there.

Ran into this in #2082. User was told that repositories were created when they were
not due to hooks symlink being wrong.

Disabled autocapitalize and autocorrect on login field

Update chnagelog



See merge request !1064

Experimental support for gitlab-git-http-server

https://gitlab.com/gitlab-org/gitlab-git-http-server

This change introduces the GITLAB_GRACK_AUTH_ONLY environment
variable. When set, Grack requests to GitLab will only respond with
the user's GL_ID (if the request is OK) or an error. This allows
gitlab-git-http-server to use the main GitLab application as an
authentication and authorization backend.

If we like how this works we should drop the GITLAB_GRACK_AUTH_ONLY
variable at some point in the future.

See merge request !1915

This sidesteps problems with running 'chmod' on some CIFS mounts.

- Updated CHANGELOG

Switch back to rouge gem for synthax highlighting

Since gollum-lib blocks rouge from updating, let's bump the version
manually. The fix has already been accepted upstream:
https://github.com/gollum/gollum-lib/commit/9c042ea0914a7714abbda9d89e234c8a79fba893