Removed padding for the map sprites.
Update README.md
Merge pull request #11 from blackline/remove-map-padding

Removed excess padding from the map sprites.
Merge branch 'master' of github.com:blackline/icarus-sprites into icon-map-change

Conflicts:
	build/sprites-general.less
	build/sprites-general.png
	build/sprites-map.json
	build/sprites-map.less
	build/sprites-map.png