add all the members that spoke in the plenum meeting

need to reparse all the protocols:

manage.py parse_plenum_protocols --reparse -v2
activate the speaker threshold for getting mks that spoke in a plenum meeting

only take into account protocol parts longer then the threshold (currently set to 40 characters)
Merge pull request #78 from astupidog/master

add all the members that spoke in a plenum meeting