added multiple city support and added alsdorf as first example
made meeting parse more customizable via command line arguments
added args for agenda_items and added custom document parser for marzahn
hopefully fixed a problem with documents appearing multiple times in the database. Also fixed a HTML problem with alsdorf
Merge branch 'multiplecities' of github.com:mrtopf/pyallris into multiplecities

Conflicts:
	pyallris/agenda_items.py
	pyallris/base.py
	pyallris/documents.py
	pyallris/meetings.py
work on factoring the argparse elements out of the individual classes into a from_args class method
converted meetings and agenda items to use the new instance construction method
added geo location search to agenda items. based on the osm import script from offeneskoeln (which I adapted and needs to be added to this repository)