fixes #17: point CocoaPods docs at mapbox.com
fixes #17: point CocoaPods docs at mapbox.com

MadeByHecho/mbxmapkit,pixio/mbxmapkit,mapbox/mbxmapkit,MadeByHecho/mbxmapkit,pixio/mbxmapkit,mapbox/mbxmapkit,MadeByHecho/mbxmapkit