Fixed bug due to ffmpeg parameter change in -map.
Fixed Drush commands for 3.4 version.

Plus a small minor enhancements:
  - added size parameter to mm-still
  - mm-job shows latest job by default
  - added mm-acl func
Added possibility for tools to provide a new filename.
Added more options to get_by_asset_id().
Rewrite scheduler/server cron function to work with lock functions.
Fixed change 109b509, use of ::create_job instead of ::create.
Fixed new filename bug introduced in 109b509.
Added 'resize' and 'quality' as parameters to tool_image.
Fixed image generation with latests job_server paths.