Mention all update guides in monthly release doc

Fixes #1328

Create 6.0-to-7.0 update guide

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

Fix 500 error when transfer project from admin area

Fixes #1349

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

Revert email threading rewrite

The 'to:' address introduced by this merge caused a flood of email going to an admin account for GitLab.com. This feature should not be shipped as-is.

Fix mistake in reference_jira_issue method (markdown)

This reverts commit 97fd990e, reversing
changes made to f451a697.

Conflicts:
	app/mailers/emails/notes.rb
	app/mailers/emails/projects.rb

Improve the spelling on the project settings page

7.0 update guide

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

Installation guide for 7.0

* Changed branch to 7-0-stable
* Bump gitlab-shell version to 1.9.6

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

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

Use local variable instead global

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>

Consistent headers

Kanban improvements

When drag from unassigned to assigned column - issue assignee avatar updated

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>

Consistent readme

Provide better email subject lines from email on push service

If one commit is pushed, display the commit message in the subject
line. Otherwise display the number of commits pushed to the repository.

Enable CentOS packaging.

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

Responsive sidebar fixes

This fixes two major issues with the responsive sidebar

1. Overlapping content by the label:
The label and sidebar is now always on the right side of the screen. This makes it always easy to find (better UX) and prevents it from overlapping most content. Additionally, on xs screens, instead of the side-attached label, for some pages it will show an extra button in the head instead of a buttons that overlaps.

2. Pop up of sidebar on changing pages.

Show file mode changes on commit page

## Before:

![Screenshot 2014-06-14 22.55.18](https://dev.gitlab.org/uploads/dzaporozhets/gitlabhq/3f89dfa841/Screenshot_2014-06-14_22.55.18.png)

## After:

![Screenshot 2014-06-14 22.54.11](https://dev.gitlab.org/uploads/dzaporozhets/gitlabhq/5e7550d595/Screenshot_2014-06-14_22.54.11.png)

move all sidebars to one side for improved UX; add button in head of projects/issues and milestones instead of tab on side of screen to prevent overlapping of content