Given a URI, returns the extension of the URI.
    
    
    
    
    
    
        
    
    
        
        | Name | Type | Description | 
    
    
    
        
            
                | uri | String | The Uri. | 
    
    
    
    
    
    
    
    
    Returns:
    
            
    The extension of the Uri.
        
    
    
    
    
    
    
    
    
    
    
    
    
        Example:
        
    //extension will be "czml";
var extension = Cesium.getExtensionFromUri('/Gallery/simple.czml?value=true&example=false');