JSON messages truncated

[malber]

I noticed an error when sending long JSON formatted messages between an Alchemy websocket server and Alchemy websocket client.
The string is not entirely transmitted and data is therefore corrupted.
The communication works fine only if client and server and on the same host.

Communication between a websocket-compatible browser and Alchemy's websocket server works fine, which most likely indicates an issue with the client implementation.

[sztupy]

Probably the same error as #25