Posted February 03, 2015
Game Developer Magazine article written by one of the programmers, Rob Huebner, on adding the scripting language to the game. Includes a screenshot of their internal level editor. Great article! Enjoy!
https://www.scribd.com/doc/212763991/Adding-Languages-to-Game-Engines
https://www.scribd.com/doc/212763991/Adding-Languages-to-Game-Engines