Added single line comments

Single line comments can now be made with Cmd + / and multiline comments created with Cmd + Opt + /, as is default for most syntax packages for Sublime Text (e.g. JavaScript).
Fixed colours typo

colours.grey and .lightGrey were written as .gray and .lightGray, the American spelling and as such would result in an error when run.
Merge pull request #13 from oeed/master

A few minor(ish) fixes