Implementations of follow() and centerOn(). Add stub for mouselook().
Implementations of follow() and centerOn(). Add stub for mouselook().

craftyjs/Crafty,maciekwie/Crafty,craftyjs/Crafty,craftyjs/Crafty,mucaho/Crafty,maciekwie/Crafty,starwed/Crafty,mucaho/Crafty,starwed/Crafty,starwed/Crafty,maciekwie/Crafty,mucaho/Crafty