Handle empty declarations with no line break between braces

As seen in Issue #2, using opening and closing braces on one line breaks the parser:

> ```
> class NSFileHandle {}
> struct String {}
> // etc
> ```

leads to this error:

> ```
> events.js:72
>      throw er; // Unhandled 'error' event
>            ^
> Error: write EPIPE
>      at errnoException (net.js:904:11)
>      at Object.afterWrite (net.js:720:19)
> ```
