Add edit button to MergeRequest diff

It will redirect you to file edit page.
After submit changes you will be redirected back to merge request.

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

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Allow access to groups with public projects.

Fixed Group avatars to only display when user has read
permissions to at least one project in the group.
set layout margin-bottom 50px
Add style guidelines in separte paragraph.
postgresql testing on travis
Limit huge images in diff

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Solve conflict and add more explanations on how to contribute.

Conflicts:
	CONTRIBUTING.md
Merge branch 'master' into styleguide

Conflicts:
	CONTRIBUTING.md
Markdown doesn't render correctly yet.
Version to 6.6.0

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
New stable branches and update guide

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Add Gemnasium Service for Gitlab

Conflicts:

	db/schema.rb
Update merge_request_observer_spec.rb
Merge pull request #6372 from gemnasium/add_gemnasium_service

Add support for Gemnasium as a project service
Merge pull request #6366 from popomore/patch-1

set layout margin-bottom 50px
Merge pull request #6369 from skv-headless/postrgesql_travis_testing

postgresql testing on travis
 Merge branch 'styleguide' into 'master'

Styleguide

As discussed.
Merge branch 'feature/edit_from_mr'

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

Conflicts:
	CHANGELOG
Merge branch 'master' of dev.gitlab.org:gitlab/gitlabhq