initial implementation of multipolygons. most relevant code stolen from iD project (thx guys!)
robustified code against only partially loaded multipolygons.
more fixes for MP rendering
change fillColor too when highlighting features
added more natural=* values to trigger polygon display
extended tag-list for line<->polygon detection.
tags found using the "taginfo-wiki" database of Jochen Topf <jochen at remote.org>; thx!
support type=boundary relations (alias for multipolygon). show relations of relations properly
let this be for now
removed deprecated todo comments
refractored "no vanishing of small polygon features" code into own leaflet extension. :)
moved OSM -> "Leaflet GeoJSON Layer" Code into own class / Leaflet extension OSM4Leaflet.js.
removed now unneeded code (see prev. refactoring commit)
updated todo list - some items already done :)
fix for map_blank badge not present in exported images
calculating some stats about the result (loaded nodes,ways,... and displayed pois,lines,polys)
updated "montains in area" example for pretty multipolygon display
added data stats information to map
added setting whether to show those stats or not (default: yes)
added setting whether to diable the poi-o-matic (noVanish) or not (default: no)
i18n for "this map intentionally blank" message
updated TODO list
added TODO item
bugfix for mp rendering