Use html5 tags for better semantic

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Ui improvements

Skip to buttons on tabbing in issues page

This will skip tabbing right to "Add comment" or "close" buttons.

http://www.w3.org/TR/html5/editing.html#sequential-focus-navigation-and-the-tabindex-attribute

For tabindex:

```
If the value is a negative integer
The user agent must set the element's tabindex focus flag, but should not allow the element to be reached using sequential focus navigation.
```

Remove observers from application

Part of #1133

Regression issue on rc

Fixes #7163, copy init script while upgrading (master branch)

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

Fix permissions

Fixes #1358

Mention all update guides in monthly release doc

Fixes #1328

If user was a member of both group and project and group access level
was higher it was not respected and user got lowest project access
level. Now it is fixed and user get highest access level
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

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

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>

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

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.

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>

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>

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

Use local variable instead global