min_height support added
simplification quality improved

table creation updated for min_height
Merge branch 'master' of https://github.com/kekscom/osmbuildings

Conflicts:
	dist/L.BuildingsLayer-debug.js
	dist/L.BuildingsLayer.js
	dist/OpenLayers.Layer.Buildings-debug.js
	dist/OpenLayers.Layer.Buildings.js
	src/geometry.js
removing height from simplification again