make generic interpreter that python-shell extends from

[Almenon]

While looking into a different issue I had a realization: pretty much the only thing in python-shell that is actually specific to python is the parseError function. Theoretically you can even override that and point pythonPath to a different interpreter!

I should probably make this as a seperate package that python-shell has a dependency upon, so others can extend it to their languages as well.

[Almenon]

wasn't able to find any packages that wrap ruby. That might be a good start to see if a python-shell base could be extended to other languages