call ReadableStream#resume() on the request

in node v0.10, [you must call `resume()` in order to get the 'end'
event][node_zero_ten]. this adds the call on the request handler.

this adds the `resume()` call to the cli. it shouldn't cause any
backwards-incompatible changes.

[node_zero_ten]: http://blog.nodejs.org/2012/12/20/streams2/