Add git-cl and git-try stubs.

Add git-cl and git-try stubs.

They automatically git clone the original repository and execute the original script. So if they are first in the path, they will be executed. If a user has another git-cl/try in the path prior, these stubs won't be used at all and won't mess with the user's setup.

Also fix a bug with git handling in trychange.py

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=17737

[M-A Ruel, 2009-06-05 15:28:57]

Supersedes http://codereview.chromium.org/118168

[Evan Martin, 2009-06-05 18:00:19]

LGTM!

http://codereview.chromium.org/119244/diff/1/2
File git-cl (right):

http://codereview.chromium.org/119244/diff/1/2#newcode12
Line 12: $base_dir/git-cl-repo/git-cl $*
I think you want "$*" (with the quotes) for full correctness -- that tells the
shell to quote each arg.