Added AI system
Updated three.js from r55 to r57
Pass correct timestamp in first call to engine.run()
Improvements to positional audio, added mute option
Material editor improvements
Use ui.treeview for admin toolboxes
Moved skybox to world system, added world_thing_add event
Added second pass for skybox rendering
Refactoring of generic thing to support better object definitions
Added convenience functions, split some thing functions into subclasses
Updated sector to work with new thing.generic
Added thing.controller subclass for AI an player control
Added things.controllable for AI and player controlled things
Added things.gridhelper
Added things.terrain and things.light
added things.turret and AI controller
Throw thing_create event after thing initialization
Added better object instancing to audiostage