Javascript (node.js) bindings

[lobis]

It would be useful to be able to call this library from node.js in order to integrate it in nodered.

Instead of rewritting the library in javascript, we could create bindings for javascript (nodejs).

The details need to be defined, I have done minimal research and it's not straightforward to create javascript bindings for python code but I think we can just use the python-shell javascript library to call this python library directly and it should work okay, since we do not care about performance. It will have to make a new connection each time it's called but this should be OK.

We should also create an npm package to allow install of the bindings, I don't think (at this time) it makes sense to publish it into a repository such as npm as it would not work without the python counter-part.