function GoogleStreetviewPanorama ( panoId, apiKey ) {

	    ImagePanorama.call( this );

	    this.panoId = panoId;

	    this.gsvLoader = null;

	    this.loadRequested = false;

	    this.setupGoogleMapAPI( apiKey );

	}
@classdesc Google streetview panorama
@description [How to get Panorama ID]{@link http://stackoverflow.com/questions/29916149/google-maps-streetview-how-to-get-panorama-id}
@constructor
@param {string} panoId - Panorama id from Google Streetview 
@param {string} [apiKey] - Google Street View API Key