CoffeeScript Keywords

This file contains simple completions for some CoffeeScript/ECMAScript keywords. I commented out the ones that are too short (2-4 symbols), some that are already treated by Sublime CoffeeScript plugin via snippets (such as `class` and `try`), some that are hardly ever used (Error classes). Some keywords like `Math` and  `JSON` I hope won't be needed here soon ;)

P. S. I decided not to delete commented lines for a while due to possible changes.