Prevent clicks on twitch video element

Added an overlay div to the player container to prevents clicks on the
video element (for #23), position to still allow clicks on the player
controls.
HTML5 Fullscreen Support

- Reconfigured player overlay to allow clicks on resolution menu
- Added button overlay to prevent clicks on flash fullscreen button
- Added HTML5 fullscreening for player wrapper div (scales overlays and
player together), usable with the overlayed fullscreen button or double
clicks on video overlay.
Merge pull request #30 from xtphty/master

make the twitch player not redirect when clicking on it in big-screen mode