[PATCH 0/2] Update git-send-email-script with --compose

As I promised Junio a few weeks ago (via private email), here's an update to git-send-email-script that fixes a few annoying things it does.

1. No longer require --subject for most uses.
2. No longer require --in-reply-to for most uses.
3. If not given as command line parameters, don't prompt for either 1 or 2.
4. Add --compose that lets the user compose an email using $EDITOR, and make
use of --subject and --in-reply-to

The first patch is the update to the code, the second patch updates the documentation to match. And the fact that this is on the list at all is proof that it works (for me, at least.)