Refactor release doc

* Follow issue as todo list instead of document
* move huge rc1 block to separate file
* cleanup and fix order of some actions

See merge request !1379

Easy dev install

@jeroenvanbaarsen  just tried the following:

1. Removing therubyracer from gemfile
2. Install node (brew install node or sudo apt-get install nodejs)
3. Run $ spinach features/

All worked as before, so this would mean people have to install the node dependency on their local machine, but in my experience this is much easier than installing libv8, especially for non ruby-devs. /cc @jacobvosmaer

See merge request !262

Async satellites

Do merge request automerge via satellite.

See merge request !1380

While loading the Rails app we cannot assume that the gitlabhq_xxx
database exists already. If we do, `rake gitlab:setup` breaks!

This is a quick hack to make sure that fresh development setups of
GitLab (from master) will work again.

Conflicts:
	CHANGELOG

Dynamic application settings in database

See merge request !1378

Update api messages

See merge request !1364

Conflicts:
	CHANGELOG

Refactor merge request merge service

See merge request !1374

Remove unused ex local variable from event.rb

Fix commit link on MR from fork

See merge request !1372

* Add system note when user merges MR in same way as it closes it
* Remove duplicating code

UI improvements

Improve filtering UI for next pages:

* dashboard projects page
* group milestones page
* project milestones page

See merge request !1370