git-cat-file: Make option parsing a little more flexible
git-cat-file: Make option parsing a little more flexible

This will make it easier to add newer options later.

Signed-off-by: Adam Roben <25c54125338b9954d8ff8ceca7f7c51ea3e5031f@apple.com>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

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