Various

Added skybox to client scene.
Added toonshaders to enemies.
Added christmas trees to gamefields, looks nice.
Fixed enemy rotation on clients. (still bit buggy)
Moved RPC's to Player.cs. Made static function that can be used on
client to get the NetworkView component of the current player.
Towers now fade-in on placement.
Some cleanup. Wasn't able to implement selling towers, more complicated
than I thought ;(