closes #454: AppBar ellipsis glyph needs css to explicitly state font family.
Closes #444
-Returns invoke button to being an actual <button> element.
-Remove superfluous tests

Closes #399
-Use the _ElementUtilities._addEventListener polyfill to listen to "pointerdown" instead of the native DOM addEventListener..

Fixed a bug in chrome and firefox where some overlays would get an outline when you mouse clicked on them.
Closes #448 Closing the minimal AppBar in IOS makes the AppBar invisible.
The fix is to use the polyfill to clear the correct transform property, based on the browser the code is running in.
Merge branch 'master' into AmazingJaze/AppBar7