FBP protocol

[bergie]

A subset of the FBP protocol would be a very nice way to expose the JsJob interface, as this way any standards-compliant FBP system would automatically be available as a JsJob. It would also add other benefits:

• Test automation via fbp-spec
• Better debuggability via Flowtrace for JsJobs that support the necessary sub-protocols
• Common communications layer with the job execution with Flowhub and other FBP tools

We could provide a wrapper for "pure JS" jobs that emulates the runtime and network parts of FBP protocol.