New player functionality.
  * Created key-selector in the DOM
  * Added functionality to create players with their key of choice
    * Added event listener
    * Added function to create player
Various changes:

* Replaced game with 'this'
* Changed Id's on key's to reflect thier code.
* Added minor changes to css.
* Added number of players to game
* Refactored
House cleaning
  * Removed some console log.
  * Added a palceholder for form.
  * Hide elements no longer needed.