First draft of dog-park-12, dog-park-18, and dog-park-24
adding dog-park icon
Merge branch 'gh-pages' into dog-park

Conflicts:
	_includes/maki.json
	www/images/maki-sprite.dark.png
	www/images/maki-sprite.dark@2x.png
	www/images/maki-sprite.png
	www/images/maki-sprite@2x.png
	www/maki-sprite.css
added while outlines to iconsdog-park icons
re-rendered icons with white outlines
updated dog-park-12 graphic to include collar
resolve conflict, minor adjustments to 12px dog park icon
Merge pull request #120 from mapbox/dog-park

Add Dog Park icon