kwalitee: new quiet operation mode option
kwalitee: new quiet operation mode option

* New -q, --quiet CLI option in the kwalitee checker, useful for easy
  batch mode operation to check many files in the manner like:
   $ cd invenio/modules/webfoo/lib
   $ python ../../miscutil/lib/kwalitee.py -q --check-some *.py

inveniosoftware/invenio,inveniosoftware/invenio,tiborsimko/invenio,tiborsimko/invenio