udpate to tests.
Merge branch 'master' of https://github.com/SpatialServer/Leaflet.MapboxVectorTile

# By Nicholas Hallahan
# Via Nicholas Hallahan
* 'master' of https://github.com/SpatialServer/Leaflet.MapboxVectorTile:
  version bump
  fixed bug where things freakout if no onClick in options
Fixed double draw problem, added visibleLayers array as option to constructor.
Removed the .visible property of MVTLayer.