Add "commit" helper script

This is meant to make raw git not hugely less usable than something
like raw CVS. I want to make a 1.0 release of the plumbing, and the
actual commit part was just too intimidating.

git-commit-script

@@ -0,0 +1,15 @@
+#!/bin/sh
+git-status-script > .editmsg
+if [ "$?" != "0" ]
+then
+	cat .editmsg
+	exit 1
+fi
+ED=${VISUAL:$EDITOR}
+ED=${ED:vi}
+$ED .editmsg
+grep -v '^#' < .editmsg | git-stripspace > .cmitmsg
+[ -s .cmitmsg ] || exit 1
+tree=$(git-write-tree) || exit 1
+commit=$(cat .cmitmsg | git-commit-tree $tree -p HEAD) || exit 1
+echo $commit > .git/HEAD