make centerAt chainable
Merge branch 'master' of https://github.com/digidem/VisualTargetedRoad

Conflicts:
	public/index.html
js work
Merge branch 'master' of https://github.com/digidem/VisualTargetedRoad

Conflicts:
	public/index.html
Merge branch 'master' of https://github.com/digidem/VisualTargetedRoad

Conflicts:
	public/index.html
	public/javascripts/map_renderer.js