Fix merge errors on CHANGELOG

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

Refactor sidebar JS logic

Move asana_service_spec to its correct location

properly paginate project events in API

Remove the email patches link for merge commits

Rugged's `to_mbox` method doesn't work for merge commits, so don't display the option to download them as email patches.  This is part of the fix for #1878, and gitlab/gitlab_git!27 allows a plain diff to be generated for a merge commit.  Together these changes should prevent the 500 errors described in the issue.

cc @sytse

See merge request !1737

We've moved external trackers to service, remove from gitlab.yml.

Fixes #1937

See merge request !1743

update acts-as-taggable-on

Change merging notification to sound more natural

See http://schacon.github.io/git/git-init.html#_template_directory

Without this variable, any global git hooks a developer might have in
~/.git_template would be linked in the `.git/hooks` folder for every
test repository that gets checked out by TestEnv, and would cause
certain specs to fail due to pre-existing hook files.

Improve UI for issues filters

![filters-ui](https://gitlab.com/gitlab-org/gitlab-ce/uploads/31109bb069a5f42a9b83c2fb44af288b/filters-ui.png)

See merge request !472

New in Rails 4.1, this eliminates spec failures due to forgetting to run
`db:test:prepare`.

Prevent holding Control-Enter or Command-Enter from posting comment multiple times.

See private issue https://dev.gitlab.org/gitlab/gitlabhq/issues/2184

See merge request !467