Changed color of selectable hover.
* Adding icons to buttons and footer.
* Fixed centering issues.
* Add/remove class of active player to main playfield.
 - Will be used for hover effects.
* Color of active player is displayed on hover.
Finished basic hover behavior when player's selecting cell.
* #stt.radial fixed for all supported forms of radial gradients.
Merge pull request #8 from TheSeg/master

Hover states style.