Added an ignore on 'lost+found' directories in the Source Lister, since
by default only root has access to this dir, which was causing
permission denied errors.
Added a Source class which executes HandBrake -t 0 to list the available titles and streams in a given source.
Added a placeholder on the source-details page to display HandBrake output
Added a SourceLister class, which enumerates all DVD folders below a given starting directory.
Added a source browse page to list the available sources
