Allow mass-unassigning of issues

Small fixes

Fixes #2062 and #2061

See merge request !1601

Fixes #867

[ci skip]

Make test element selection more specific to fix constantly failing test.

Fixes #2051.

The problem was that there were two `.note-text` elements matching `.files [id^=diff]:nth-child(2) .note-text`, one for the new comment, and one for the (currently hidden) new comment form. The latter one was selected but currently invisible, triggering the following error in poltergeist:

> The element you are trying to interact with is either not part of the DOM, or is not currently visible on the page (perhaps display: none is set). It's possible the element has been replaced by another element and you meant to interact with the new element. If so you need to do a new 'find' in order to get a reference to the new element.

This caused the test to fail.

See merge request !1592

Prevent another migration from failing due to indirect use of model columns not yet created

See https://github.com/gitlabhq/gitlabhq/issues/8817#issuecomment-76007077

cc @marin

See merge request !1597

Fix git syntax issue for git version older then 1.7.10

For #2067

See merge request !1599

Generalizes image upload in drag and drop in markdown to all files

From https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/265 by Hannes Rosenögger.

- [x] Rebase on master when !1553 is merged in

See merge request !1530

Gracefully shutdown services in Docker container

Conflicts:
	app/views/import/gitorious/status.html.haml
	db/schema.rb

Bump gemnasium service gem

# Conflicts:
#	app/controllers/files_controller.rb

UI: refactor header css

See merge request !1591

Improve admin projects and users pages for mobile devices

See merge request !1590

Give last_activity_at a default value so it will always be set

For https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/345

See merge request !1589

Fix 404 when deleting a project from the admin section

This is some additional fallout from the rails upgrade. Need to use plural namespaces in the path function to get project deletion to go back to the project listing.

See merge request !351

Updated Gitorious import icons

See merge request !353

Improve contributed project and commit calendar selection.

Fixes #2024.

See merge request !1554

Update gitlab-grack to 2.0.0.rc2

See merge request !1585

Toggle sidebar button more obvious

The toggle is now at the top of the sidebar because it is not noticeable
near the bottom. By placing it at the top, users will immediately know that
they can have more space if they desire versus on the bottom, they will have
to search for it and that's not desired.

Fixes #2044

See merge request !1579

Conflicts:
	Gemfile.lock