message: Add comment for "is" attribute.
diff: @@ -417,7 +417,7 @@ export default React.createClass({
  <div className={this.state.loading ? 'mx_AppTileBody mx_AppLoading' : 'mx_AppTileBody'}>
  { this.state.loading && loadingElement }
  <iframe
  - is
  + is // This is required in order to enable passing of that "allow" preoperty, which is unknown to react 15
  allow={iframeFeatures}
  ref="appFrame"
  src={this._getSafeUrl()}
  