Rewrite and improve git backend logic. Fix project movind. Raise exception to prevent unexpected issues

Project -> update repo only on create and destroy. Fixtures Updated with namespaces. Fixed moving repo

Turns out git commit returns with 128 when user.name config not present.

Also updated status task and installation instuctions.

When working inside of a Vagrant box with NFS enabled, the deletion of a
repository in tmp/ doesn't work every time.

It is related to NFS inability to delete a folder if it's still used by
a resource (e.g. `rm -rf ./folder` would leave the folder and a .nfs*
    file in it). In this case it's the temporary repository which can't
be deleted because `ga_repo` is still using it.

De-allocating ga_repo is not possible (thanks Ruby), but deleting the
folder it points to in the first place fixes the issue.

Reference:
http://stackoverflow.com/questions/11228079/python-remove-directory-error-file-exists

Merge branch 'master' into non-interactive-aws-install

Conflicts:
	doc/installation.md

Fix merge mess in installation.md

Simplified gitolite handle logic
Stubn over monkeypatch
Stub only specific methods in Gitlab:Gitolite
Moved grach auth to lib
added specs for keys observer
removes SshKey role

* Grit gem updated
* gitolite-client updated
* logger added
* few fixes

Rake task to provider full repo access for gitolite-owner.\n  Automerge requires gitlab user be able to push to any repo

ProtectedBranches model, Master permission for repo\n Allow push to protected branch for masters only

Users with many projects (>100) will hit the 20 second timeout when
updating the gitolite config. This fix batches those changes into a
signle update to the file, causing an order of magnitude speed increase
which finishes well below the 20 second timeout.

Fixes gitlabhq/gitlabhq#220