Merge pull request #170 from aplanas/master

Remove useless oscs
support X11:Bumblebee as prj
Merge pull request #171 from openSUSE/coolo_bumblebee

support X11:Bumblebee as prj
Detect when there is only one repo as a candidate.
Initial tests for checkrepo.
Fix description.
Initial steps to detect valid packages in the cache.
Remove the print in check_specs.