Merge branch 'ph/stash-save-m-option-fix'

In addition to "git stash -m message", the command learned to
accept "git stash -mmessage" form.

* ph/stash-save-m-option-fix:
  stash: learn to parse -m/--message like commit does

diff --cc git-stash.sh
Simple merge

diff --cc t/t3903-stash.sh
Simple merge