Highlight ES6 object method shorthand syntax

[LPGhatguy]

ES6 has a shorthand syntax for defining methods on objects similar to that of a class.

The method declaration in

let x = {
 hello() {
 let hello = "world";
 }
};

should have the same highlighting as

class X {
 hello() {
 let hello = "world";
 }
}

In the current TypeScript Sublime Text plugin, the method name in the first code sample is not highlighted:

(as a side note, GitHub has the same highlighting issue at present; do they use this repository?)

[sheetalkamat]

Fixed by #257