One-liner: fix greenery texture artefacts.

mapzen.xml
	-Patches of greenery were being incorrectly rendered all across
	our map: the culprit clause seemed to be matching all `roads`
	features with a `highway: residential` key-value pair, instead
	of only those with `kind: residential`.
Add Android assets.

patterns/, styles/, textures/
	-Add all the map stylesheet-related assets used by the Mapzen
	Android app.

mapzen.xml -> styles/mapzen.xml
	-Move the map stylesheet into its appropriate directory.