Use getPath for error message as it is more detailed
Updated warning messages
Added support for cubemap asset
Can now load a cubemap from a json file
Fixed comment
Fix material cubemap loading when the same material is loading at the same time
Added anisotropy to cubemap asset
Changed _loadCubemapTextures to return a promise
Removed unused variables
Use RGB format for jpg textures and RGBA otherwise
Merge pull request #91 from playcanvas/feature/cubemap-asset

Added cubemap assets