fix from_git
cron_enco.py: launch encoders from git with the correct parameters
TransformWorker: Make sure elapsed_time is always set before returning
TransformWorker: simplify bash_cmd
cron_enco.py: fix extension when using x264
cron_enco.py: encoding using various bitrates
TransformWorker.py: Use '--depth=1' with git clone
cron_enco.py: avoid using the same name for different outputs