added an icon for any amenity
added sourcecode for buildings to calculate center of the building (with
a polygon)
added ways for buildings
Merge branch 'master' of https://github.com/wmw24/SASAsightsee.git

Conflicts:
	src/wmw24/sasasightsee/client/SASAsightsee.java
added some images
added 2 more urls for wayrelated buildings (buildings with polygons)