Javascript Client Request Issue #66

Looks like the client _requests_by_id and _requests_by_timestamp are Map objects and should use set/get. Also, the timeout passed to the request method is multiplied by 1000000. I would think since the timestamp is milliseconds and the timeout is milliseconds that no conversion would be needed. Once I modified the Map objects to use set/get and removed the timeout multiplier, the client request seemed to work as expected. Thanks.