code: function(appConfig) {
  
  		// check for valid app configurations
  		if (!appConfig.appId) {
  			F2.log('"appId" missing from app object');
  			return false;
  		}
  		else if (!appConfig.root && !appConfig.manifestUrl) {
  			F2.log('"manifestUrl" missing from app object');
  			return false;
  		}
  
  		return true;
  	}
docs: Checks if the app is valid
  @method _validateApp
  @private
  @param {F2.AppConfig} appConfig The F2.AppConfig object
  @returns {bool} True if the app is valid