ic_pin icons

(cherry picked from commit 8d1dde75c6f38c093e0f343efb1c72508ad83601)

Conflicts:
	assets/styles/mapzen.xml
refactoring how pins and bitmaps are added using the AndroidGraphics.makeMarker method
Organizes imports.
Merge pull request #97 from mapzen/baldur/icon_usage_refactor

Baldur/icon usage refactor