Remove coordinates object from player.js file.

It is already in wgo.js
New wood textures
Test of subtle skeumorphism on the goban
Major graphical changes of the board

New configuration property "theme" has been added to the board object.
It defines all graphical aspects with exception of board and stone
textures. See "Board.themes.default" for its structure and default
values.

Appearance of the board has been also changed. However you can still use
the old look, if you set property "theme" to "WGo.Board.themes.old".