ES6 modules export { var1, var2, ... } doesn't work.

`m` is not exported in this example. But should. As result, I cannot use TypeDoc for in my libraries, thus, severity 'critical'.

Could we do something about it? May be I'm doing something wrong?

``` typescript
export const on = Events;
export class X {};
export interface Y {};
export function f(){};

let m = 5;
export { m };
```
