request-pull: minor tweaks.
request-pull: minor tweaks.

 - use --verify to make sure rev param is a rev, and barf otherwise.
 - make it always output to stdout; no funny business with tee.
 - take optional branch head name to specify which branch to summarize.
 - show baserev in a human readable way.
 - do not depend on diffstat; use git-apply --stat instead.

Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

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