trivial: Add klass padding to the Asb objects
trivial: Don't use asb_context_find_in_cache() twice in the builder
Use --add-cache-id when generating Fedora 21 metadata
trivial: Be less verbose when downloading Fedora packages
trivial: Demote 'Adding extra package' to a debug
trivial: Update the ignore metadata when a package is updated
Do not allow plugins to remove applications

Instead force them to veto applications, which at least means we get a CacheID.