Prepare 1.0.4 release

Merge pull request j-guyon#8 from jondmcelroy/DocumentationUpdate

Added instructions for adding the bundle to a particular entity manager

Update index.md

Update assetic section

 - Bug fixing : After edit a scheduled command, its last execution da…

…te was lost

 - Move ScheduledCommandType into Type directory
 - Add a message in scheduler:execute when there is nothing to execute
 - is_writable test for log file is skipped on  "gaufrette:https://" path (not support directory)

Update composer.json