Ths commit does next:

* When we remove project we move repository to path+deleted.git
* Then we schedule removal of path+deleted with sidekiq
* If repository move failed we abort project removal

This should help us with NFS issue when project get removed but
repository stayed. The full explanation of problem is below:

* rm -rf project.git
* rm -rf removes project.git/objects/foo
* NFS server renames foo to foo.nfsXXXX because some NFS client (think
* Unicorn) still has the file open
* rm -rf exits, but project.git/objects/foo.nfsXXX still exists
* Unicorn closes the file, the NFS client closes the file (foo), and the
* NFS server removes foo.nfsXXX
* the directory project.git/objects/ still exists => problem

So now we move repository and even if repository removal failed

Repository directory is moved so no bugs with project removed but
repository directory taken. User still able to create new project with
same name. From administrator perspective you can easily find stalled
repositories by searching `*+deleted.git`
Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: NJeroen van Baarsen <jeroenvanbaarsen@gmail.com>

The deletion from the admin section was redirecting to the wrong address.

This commit generalizes the image upload via drag and drop so it supports all files.
It also adds access control for these files.

Make the following changes to deal with new behavior in Rails 4.1.2:

* Use nested resources to avoid slashes in arguments to path helpers.

Resolves #1673.

Instead of loading all issues and merge requests we load only open one.
This will reduce time load for autocomplete resources significantly

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

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

Now you can fork project into group or personal namespace.
Also I moved fork logic from ProjectsController to own fork resource
Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Always delete repositories from the filesystem when deleting a project.

Also memoize the method to ensure that other methods in
ApplicationController that rely on it can call it efficiently.

Redundant with the authorize_read_project! filter

Enable Markdown previews when creating and editing issues, merge
requests, and milestones, and when editing notes.

Neither controller nor any of it's descendants have those actions.

Update the project API controller to use `Projects::DestroyService`
instead of calling `Project#destroy` directly.

Also add an optional parameter, `:keep_repo`, that allows a project to
be deleted without deleting the repository, wiki, and satellite from
disk.

Fine-tune the Remove Project redirect. Now it redirects to admin_projects_path and shows a flash message confirming the action has been taken.

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

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

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