Allows to pass url to WE.tileLayerJSON to create a new layer ( WE.tileLayerJSON('url', app) ), but if the url was passed instead of object, the tileLayerJSON returns null at the moment (the layer object itself is created in the future, so it cannot be returned at the moment). It might be possible to create a layer with "default" parameters and modify these after the JSON is loaded. (issue #7)
Modified cesium FXAA shader to calculate alpha values as well as the color components (fixes #6)
Updated to the new plovr version
Slightly improved support for mobile devices (issue #8)