Taskhub: Small improvements and a compile fix

Change-Id: I59738bb434b4daa664173404cb9bc7555aace4c8
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Git: Add reflog

Change-Id: Id328492826bdcf4b7f7e6933a9dc3931174de0fb
Reviewed-by: Petar Perisin <petar.perisin@gmail.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Git: Fix side-by-side show opened from interactive rebase editor

Change-Id: Iceb9a536f6dc53bd9a61cbf5b6bab14154196628
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>