Additional arguments for 'git cleanup'

Optional args for the following:

* -D: Delete a branch irrespective of its merged status.
* -d: (default) The branch must be fully merged in its upstream branch, or in HEAD if no upstream was set
* -K: force remote KILL even if local branch is not found or can't be deleted.
* -r \<remote\>: (default:origin) lets you set a custom remote.