Allow arguments to be passed to executors

There are situations in which I'd like to change the behaviour of
and executor without having to specifically write a new one. For example,
Interactive mode w/ paramiko for certain devices. You can now pass
args/kwargs to executors.

Bump minor version. While I fixed a previous backwards incompatible change,
I've introduced some new ones. Once I make it to 1.0 I'll try to be better
with semantic versioning.

At setuptools import to top of setup.py as it makes errors go away.