[protocol] Evaluate REST + Stream protocol

[lerwys]

Problem: Often, we want our protocol to have a control (which can be slow, but has to be very extensible and easy to understand) part and a fast binary (for data acquisitions, which must be fast, but can be more complex and not so extensible).

Currently, we use a simple framing protocol on top of Malamute which does both jobs not so well. We do the control part OK, but the acquisition part we must poll the server for completion.

Possible solution: Implement a REST protocol (http://hintjens.com/blog:86, http://rfc.zeromq.org/spec:40) for the control part and a On-Demand Streamed Data (https://github.com/zeromq/malamute/blob/master/MALAMUTE.md) for the data acquisition part.