docs: function WebJsonDatasource(datasourceUrl, parameters) {
  	this.name = 'WebJson';
  	
  	if (typeof datasourceUrl == 'string') {		
  		this.datasourceUrl = datasourceUrl;
  		ReportDatasource.call(this, parameters);
  	} else {
  		// load from object def
  		for(var property in datasourceUrl) {			
  			this[property] = datasourceUrl[property];
  		}
  	}
  }