AtlasLoader Class
The atlas file loader is used to load in Atlas data and parsing it When loaded this class will dispatch a 'loaded' event If load failed this class will dispatch a 'error' event
Constructor
AtlasLoader
    
        
            (
    
    
    
    
    
    
    
    
    
    - 
                    
                        url
- 
                    
                        crossorigin
Parameters:
- 
                    
                        urlStringthe url of the JSON file 
- 
                    
                        crossoriginBoolean
