Return 40x error codes if branch could not be deleted in UI

### What does this MR do?

This MR makes `BranchesController` return the proper status code in case of a failure to delete a branch.

### Why was this MR needed?

Deleting a branch would always return status 200, even if the branch could not be found or deleted for some reason. This was confusing because while trying to debug an issue with encoded slashes, it looked like the deletion was successful when it had failed.

### What are the relevant issue numbers?

This issue was uncovered in #1804

See merge request !823

Add ref switching support for graphs

It is now possible to view contributor and commit statistics for
refs beyond the default branch. While the Git ref already was part of
the path it has not been used before.

Additionally, the code in RefsController#switch has been slighliy
refactored since it would have become confusing with additional if-else
branches added.

See merge request !932

It is now possible to view contributor and commit statistics for
refs beyond the default branch.

Additionally, conditions in RefsController#switch have been refactored
in order that a `case` block is used now.

Use teaspoon instead of jasmine:ci

Disable sticky diffs

Revert feature introduced in https://github.com/gitlabhq/gitlabhq/pull/8760

Why?

* It has unfixed bug for long time which is really annoying - https://github.com/gitlabhq/gitlabhq/pull/8760
* I was not able to properly fix it
* It affected performance in bad way

See merge request !935

Audit log for user authentication

https://dev.gitlab.org/gitlab/gitlabhq/issues/2318

See merge request !931

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

This reverts commit af44c650.

Add Irker service configuration options

### What does this MR do?

This MR makes a number of hard-coded Irker parameters configurable in the service settings: Irker server host, port, and default IRC URI. It also removes the "max recipient" limit since the recipient list is configurable only by the project owner, and it makes no sense to update the limit when it is implied in the recipient list already.

### Why was this MR needed?

The existing service assumed that gitlab.com was running an Irker daemon on `localhost` when it was not. Using Irker on gitlab.com thus did not work at all. This MR allows users to provide their own Irker daemons.

### Are there points in the code the reviewer needs to double check?

My main concern is whether allowing a user to specify the server/port combination would have security implications for a host. Given that HipChat and Slack allow users to do this, I didn't think this was doing anything novel.

### What are the relevant issue numbers?

* Closes #1713
* Closes #1714
* Closes gitlab-com/support-forum#139

### Screenshots

### Before

![image](https://gitlab.com/stanhu/gitlab-ce/uploads/2eb3eb815e249e9fb669fc97ecd4f3c8/image.png)

### After

![image](https://gitlab.com/gitlab-org/gitlab-ce/uploads/cceaba951c05bd3df2c842cc68046b87/image.png)

See merge request !930

fixed link to gitlab-basics

Fixed link to gitlab-basics

See merge request !1887

Improve documentation of lists in Markdown

See merge request !899

Closes #1713
Closes #1714
Closes gitlab-com/support-forum#139

Allow user to be blocked and activated via the API

When authenticating against LDAP if a user has been disabled in LDAP they can no longer log on to the website or commit over http(s) but will be able to commit using any ssh keys.  This functionality allows us to look for users in GitLab that no longer exist in LDAP and disable then in GitLab.

Closes Feedback item: [Add administrative API call to block users](http://feedback.gitlab.com/forums/176466-general/suggestions/4098632-add-administrative-api-call-to-block-users)

See merge request !587

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Changed the reference from gitlab cloud to gitlab.com because it was outdated.

This one confused me a bit because i was searching for gitlab cloud and the first thing i saw: "It's gone and now it's gitlab.com"
So to prevent anyone other than me from being a bit puzzled this little change should help

See merge request !929

Fix redirection to home page URL for unauthorized users

Redirection to the home page URL was broken by changing the target for
`root_url` from `DashboardController` to `RootController` in
94d3c143. This regression was introduced
in the 7.12.0 release.

Fixes #1916.

See merge request !928

Redirection to the home page URL was broken by changing the target for
`root_url` from `DashboardController` to `RootController` in
94d3c143. This regression was introduced
in the 7.12.0 release.

Fixes #1916.

Change RC/final package release timing

Creating the packages one day before the release feels strange, especially in a month like this (June 2015) where the release is on a Monday.

I think it is better to have one more RC.

See merge request !1873

Add support for unlocking users in admin settings

### What does this MR do?

This MR gives the ability to unlock a user from the Admin panel.

### Why was this MR needed?

If a user fails to login a certain number of times, Devise locks the user out for a certain amount of time (e.g. 10 minutes). There is no way for an admin to unlock a user if this happens (aside from editing the `locked_at` field entirely).

### Screenshots

#### Admin index page

![image](https://gitlab.com/gitlab-org/gitlab-ce/uploads/14c661d1d1f026770997b19af714c514/image.png)

#### Admin edit user page

![image](https://gitlab.com/gitlab-org/gitlab-ce/uploads/0c6f795757e5f03eeb923d818b7d6a96/image.png)

### What are the relevant issue numbers?

This replaces !288.

Closes https://github.com/gitlabhq/gitlabhq/issues/9381

See merge request !922

'created_at DESC' is performed twice

If you are already sorting in descending order in the created_at, it is run twice when you run the .recent.

It has passed in the string 'created_at DESC'.
Ruby on Rails is directly given to the SQL.
It is a slow query in MySQL.

See merge request !825

If you are already sorting in descending order in the created_at,
it is run twice when you run the .recent.
It has passed in the string 'created_at DESC'.
Ruby on Rails is directly given to the SQL.
It is a slow query in MySQL.

Closes https://github.com/gitlabhq/gitlabhq/issues/9381

Correctly show anonymous authorized applications under Profile > Applications.

Fixes #1907.

Access tokens that were created using the ["Resource Owner Password Credentials" flow](http://doc.gitlab.com/ce/api/oauth2.html#resource-owner-password-credentials) by the user entering their username and password don't have a connected application, so the Profile > Applications page used to crash. These tokens are now rendered as "Anonymous" and can be revoked.

![Screen_Shot_2015-07-02_at_11.53.55](https://gitlab.com/gitlab-org/gitlab-ce/uploads/0fb044ce1fbf5d5e2825c3abee7763ee/Screen_Shot_2015-07-02_at_11.53.55.png)

See merge request !924

Add Troubleshooting section to SAML doc.

In response to #1898. We'll properly fix it in another MR.

See merge request !917