Jupyter kernel

[arteymix]

It is surprisingly not that difficult to implement!

• http://jupyter-client.readthedocs.io/en/latest/kernels.html
• https://github.com/geoffjay/zmq-vala for ZeroMQ client
• I already wrote a MessagePack VAPI if we want to use an efficient serialization, otherwise JSON is file
• libvala to evaluate snippets as main blocks

Initially, it wouldn't be too terrible to reevaluate snippets, but eventually we might try to move that into shared objects that we link and execute to save recompilation time.

[rainwoodman]

I'd avoid JSON like a plague. A vala kernel that runs like a scripting language will be quite cool.