Unbind task item checkbox events and then rebind them

Fixes #1340

This issue was caused by this line: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/app/views/projects/issues/update.js.haml#L17

`new Issue()` gets called on every JS-based issue update, and all the binds in the constructor get re-applied without first unbinding the existing ones. Right now my fix is *only* for the checkbox events, and I suspect there are similar issues still present for other events.

See merge request !478

Don't leak private group existence by redirecting from namespace controller to group controller.

See merge request !440

Fix admin user projects lists.

The admin user personal projects lists wasn't being rendered anymore.

cc @marin

See merge request !442

Better looking milestone lists

### Before

![milestone-before](https://gitlab.com/gitlab-org/gitlab-ce/uploads/1366ade74d76b067fdc8707d31d2bffc/milestone-before.png)

### After

![milestone-after](https://gitlab.com/gitlab-org/gitlab-ce/uploads/80ae1c1f77eae5dff8ee61c4271bec17/milestone-after.png)

See merge request !484

Fixes #1340

Allow ability to delete branches with '/` in name

Fixed issue where only 25 commits would load in file listings

Fixes #1310

See https://gitlab.com/gitlab-org/gitlab-ce/tree/master and it will only show the first 25 files commit messages.

See merge request !477

Update documentation on issue closing pattern.

See merge request !475

Added badge to commits tab

Fixes #1261

See merge request !465

Fix merge errors on CHANGELOG

API: Events paginate

Updated the api method for /project/:id/events, to use the paginate method instead of limiting and offsetting the recent events in the method itself.

This will also change the first page to be 1 instead of 0, but using 0 will still work and will give back the first page.
This also add's the link headers (next/first/last).

See merge request !267

Bump Docker build to GitLab v7.9.1

Upgrade GitLab from v7.9.0 to v7.9.1.

See merge request !476

During merges (d554070a and 497fd75d) changelog was "damaged", I restored the tagged 7.9.1 and added the required changes about 7.10.0 (unreleased). I think we need to ensure all PR are rebased on master before merge.

LICENSE year update

Repo buttons

Fixes #796

Moved the star & fork button to inline with the other buttons.

See merge request !473

Star and fork buttons moved up

Prevent note form from being cleared when submitting failed.

When you try to submit a comment while you're not connected to the internet or while your connection is having trouble, the AJAX request would fail and the note would be deleted 😢

See merge request !468

Add ActiveRecord::Migration.maintain_test_schema! to spec_helper

Define GIT_TEMPLATE_DIR environment variable in TestEnv