Mention group and project names in flash messages upon create, update and delete.

Mention group and project names in flash messages upon create, update and delete. I also changed some wording inconsistency.

**Before**

![project_created](https://gitlab.com/axil/gitlab-ce/uploads/b91b92e46b08d6c566acee8d88fccff1/project_created.png)

**After**

![project_created_after](https://gitlab.com/axil/gitlab-ce/uploads/56db5125f2769386c43cf9e2f175a54d/project_created_after.png)

See merge request !1070

Add specific ability for managing group members

To be used for https://dev.gitlab.org/gitlab/gitlab-ee/issues/290 (Internal issue)

See merge request !1059

Fix multi-line syntax highlighting

### What does this MR do?

This MR fixes multi-line syntax highlighting in the code views. HTML span elements only apply to a single line, and in the case of multi-line comments, the highlighting was dropped as a result. Ensure that each line has
the proper styling to fix this.

### Why was this MR needed?

The current styling was broken for a while.

### Screenshots

Before:

![image](https://gitlab.com/stanhu/gitlab-ce/uploads/bbcb61760ab04a010aabc40942a2c0ba/image.png)

After:

![image](https://gitlab.com/stanhu/gitlab-ce/uploads/48f61c91b6fdd9c99cd7f3d214853141/image.png)

### What are the relevant issue numbers?

Closes #1577
Closes #1495

See merge request !1079

HTML span elements only apply to a single line, and in the case of multi-line
comments, the highlighting was dropped as a result. Ensure that each line has
the proper styling to fix this.

Closes #1577

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

This change was made to match the project deletion.

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