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

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

This reverts commit c217860a.

Update gitlab-linguist

Closes #1859

See merge request !1588

Web Editor: save to new branch

Implements #1931

See merge request !1523

This was done to show difference between Open/Close toggle, which
was using the same arrow as Back to Settings button previously.

access

Update Changelog

typo fixed

fixed a typo in an url to gitlab-ssl. Now it does not return the 404 error

Added Profile tooltip

For consistency sake, the profile in the navbar has a tooltip.

Fixes #2007

See merge request !1572

Diff headers made sticky

Trigger merge request hook when source updated

Don't cache classes in tests

Updated spring

Update charlock_holmes to 0.7.3

Improve sidebar menu for project settings

See merge request !1582

Bump gitlab-shell to 2.5.4

For #2042

See merge request !1584

LDAP users don't need to set a password to Git over HTTP.

Fixes https://github.com/gitlabhq/gitlabhq/issues/8846.

See merge request !1575

Using gitlab url to build links for gitlab issue tracker and add a spec.

Fix for https://gitlab.com/gitlab-org/gitlab-ce/issues/1107

This needs to go to master as the paths changed since rails upgrade

Fix for stable branch is in https://dev.gitlab.org/gitlab/gitlabhq/merge_requests/1574/

See merge request !1573

Make services migration more reliable

Fix for #2045 . I did not use SQL because its hard to convert SQL fields into json with interpolation and without errors. SO I just improved current migration with next:

* skip validation to prevent exception because of new `template` field in validation
* check column for existance before adding them.
  It should allow people who already failed this migration to re-run ti
* select objects with 500 batch size for better memory usage

Tested on migration from 7.0 to 7.9.0.pre

See merge request !1581

Allow non authenticated access to avatars

For #2047

cc @douwe

See merge request !1583