Also execute GitLab CI on creating tag via UI

When push tag - trigger GitLab CI

See merge request !1383

Fix File blame not respecting branch selection

See merge request !1382

Flatten the directory hierarchy while there is only one directory descendant

In some languages, especially java, the directory structure reflects the package structure.This means that using the file tree browser to reach the directories that matter you have to click a lot of directories containing only another subdirectory.

This merge request tries to enhance this by showing and providing the link to the first directory that doesn't contain only one directory.

See also [this feature request](http://feedback.gitlab.com/forums/176466-general/suggestions/6236769-jump-forward-to-the-first-folder-that-has-more-tha)

This is very similar to what [GitHub does](https://github.com/blog/1877-folder-jumping), but I don't think graying out the empty directories is really necessary.

Screenshots: [Before](https://gitlab.com/uploads/marmis85/gitlab-ce/b683a0000f/before.png) - [After](https://gitlab.com/uploads/marmis85/gitlab-ce/a23725a1c1/after.png)

I'm actually very new at ruby, rails, haml, and almost everything involved in Gitlab's development...
From what I could understand, when we render each directory item in the list we only have the data structure representing the item but not his descendants.
To iterate through the hierarchy I call Gitlab::Git:Tree.where() but I'm not sure if this is the most efficient way.

I also considered making every directory a clickable link, but I tried that and in the end it wasn't very useful and reduced the click target for the most useful directory.

See merge request !275

Release doc

See merge request !1381

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