Add Syohei Yoshida's git-messenger package.

Currently the readme is a little spare as the package commentary is
empty. I'll submit a patch upstream for that.
Merge pull request #820 from stsquad/add-git-messenger

Add Syohei Yoshida's git-messenger package.
New package "repl-toggle"
Merge pull request #822 from tomterl/master

New package repl-toggle
Add muttrc-mode recipe
Merge pull request #823 from travitch/muttrc-mode

Add muttrc-mode recipe
Add sml-mode
Add ob-sml
Show total number of downloads
Add highlieht-unique-symbol recipes

https://github.com/hitode909/emacs-highlight-unique-symbol
Merge pull request #824 from yasuyk/highlieht-unique-symbol

Add highlieht-unique-symbol recipes
Add launch
Merge pull request #825 from sfllaw/launch

Add launch
Add commander recipe.
Add edbi
Merge pull request #826 from rejeep/master

Add commander recipe
Use Carton for running Ecukes tests.
Merge pull request #828 from rejeep/use-carton-for-ecukes

Use Carton for running Ecukes tests.
don't need .gitmodules anymore
Add recipe.