Fix Drush autocompletion.
Issue #605: Remove drush-6.1.0 folder as it is no more used.
Add composer bin into /home/assos/.composer/vendor/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/games:/usr/local/sbin:/usr/local/bin:/home/assos/bin.
Unlog: update conf to use the proper SMTP server.
Install unlog in a venv because of new dependancies.
Close #533
Passage à drush 6.1.0
