shadow dusk/dawn tweaks
Merge branch 'master' into sketch-patch

Conflicts:
	dist/OSMBuildings-Leaflet.js
	dist/OSMBuildings-Leaflet.js.gz
	dist/OSMBuildings-OpenLayers.js
	dist/OSMBuildings-OpenLayers.js.gz
Fix for flipped perspective on some latitudes

Debug layer added
Merge branch 'master' into sketch-patch

Conflicts:
	build/config.js
	dist/OSMBuildings-Leaflet.debug.js
	dist/OSMBuildings-Leaflet.js
	dist/OSMBuildings-Leaflet.js.gz
	dist/OSMBuildings-OpenLayers.debug.js
	dist/OSMBuildings-OpenLayers.js
	dist/OSMBuildings-OpenLayers.js.gz