Proposal: allow super in object literals

Nobody has claimed this yet.

[As seen on MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/super#Using_super.prop_in_object_literals).
```coffee
obj1 = ->
method1: ->
console.log 'method1'

obj2 =
method2: ->
super.method1()

Object.setPrototypeOf obj2, obj1
obj2.method2() # logs "method1"
```

The `obj2` variable would transpile to:
```js
obj2 = {
method2() {
super.method1();
}
};
```

Use the MDN reference and the CoffeeScript examples in the issue as the starting point, then inspect how object literals and existing super syntax are compiled. The work is done when the example compiles to an object method using super.method1() and the resulting call behaves as shown.

Written by the indexing model from the issue text.