Include pull command line in email notifications

We now include the `git pull ssh://.../project refs/changes/...`
command line right below the web URL when sending out notice of
a new change or new patch set for review.

Bug: issue 285
Change-Id: Ife86d368944dc7a52c701a7ec306155cd0ed50c8
Signed-off-by: Shawn O. Pearce <sop@google.com>
7 files changed