Fix MR commenting system when new commits pushed

Fixes #1608

This conmmit fixes wierd behaviour when you see wrong comments about new
commits in merge requests.

Short explanation of a bug:
When you push new commits to project we updated `project.merge_requests`
with comment about push. But `project.merge_requests` includes also
merge requests from forks to origin project. So when you push to master
branch it commented on all merge requests from forks to origin where
source_branch was `master`

See merge request !1108

Fix ref parsing in Gitlab::GitAccess

See merge request !1107

This conmmit fixes wierd behaviour when you see wrong comments about new
commits in merge requests.

Short explanation of a bug:
When you push new commits to project we updated `project.merge_requests`
with comment about push. But `project.merge_requests` includes also
merge requests from forks to origin project. So when you push to master
branch it commented on all merge requests from forks to origin where
source_branch was `master`

Use FileUtils to delete instead of File

Add to monthly doc that reverting is an option

See merge request !1106

[UI] Set textarea resize:vertical by default.

[refactor] Factor out commit list from compare and new MR.

Fix link_to_reply_diff.

Factor issue and MR edit form error list.

Factor error and success methods from services.

cleanup empty repo page

Merge branch 'spinach-step' of https://github.com/cirosantilli/gitlabhq into cirosantilli-spinach-step
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Conflicts:
	features/steps/project/markdown_render.rb

[factor] Prefix Spinach features with Spinach::Features::.

Update highlight.js to 8.2

highlight.js generated using build script `build.py` for all languages.

See merge request !175

7.4 development

Development branch during `master` code freeze for 7.3

See merge request !1096

Monthly release document update

See merge request !1092

Use FileUtils::rm_f to delete the satellite lock file.

Conflicts:
	doc/install/installation.md

Revert sticky headers

See merge request !1104

This reverts commit 6eb85b1a.

Save last scrollposition and scroll back when leaving ZEN mode

improve 7.3 upgrade process & redis setup

update gitlab shell to 1.9.8 for gitlab 7.2.2