git-completion: add "git stash"
git-completion: add "git stash"

This is a new addition to 1.5.3; let's teach it to the
completion before the final release.

[sp: Added missing git-stash completion configuration]

Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>
Signed-off-by: Shawn O. Pearce <f01032651c12a22b2103346ba96b3b6b231f9d3c@spearce.org>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git