Fix merge_request_diffs migrations for postgresql

Document the stash of changes during the upgrade

Host No Scheme

People keep adding http in front of the host FQDN, this comment informs them this is not needed.

https://groups.google.com/forum/#!topic/gitlabhq/HPOn51ZcQFs

Merge Window

Upload Limits

Better documentation for the upload limit. Please have a hard time when they need to change the upload limits, see https://gitlab.com/gitlab-org/gitlab-ce/issues/5

Document Chunked Transfer

Recommend standard MRI implementation

Remove snippet expiration date from UI

Mobile UI improvements

Reduce image size.

improve upgrader "latest version" message

Style navbar toggle button

Style navbar toggle manually instead of with button classes

Style navbar

Modify color

Turn off all tooltips for touch devices

Style main nav

Fix scrolling navbar collapse

Style tweaks

Minor tweaks

Style no ssh key message

Update installation.md with new git version

Database Confusion

To prevent https://twitter.com/TechIsCool/status/426133762032676865

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

A test was broken if running on a non-standard port.
Made checking for (non-)standard port more robust.
Changed gitlab_on_non_standard_port to gitlab_on_standard_port (less negative).

Remove empty ErrorsController

Reference style links with relative links in markdown

#996

```
Adds relative links support to reference style links, eg:

[GitLab API doc directory][GitLab API directory listing]

[Maintenance][Maintenance rake task]

\[GitLab API directory listing]: doc/api/
\[Maintenance rake task]: doc/raketasks/maintenance.md
```

Permissions: Developer can manage issue tracker now

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

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

Improve merge request accepting logic

Add locked state to merge request during `accept` action.
Prevents mr being `triggered as merged` twice (hooks, emails etc)
Fixes #998 #729

Conflicts:
	spec/models/project_spec.rb

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