Merge pull request #97 from cjoelrun/flake8

fix flake8
add ipython import tool
add module docstring
add ipython to readme
flake8
Merge pull request #98 from cjoelrun/ipython

Ipython
run chef-client twice on computes to propogate host keys
run after all have finished
keep tmux windows open
Merge pull request #99 from cjoelrun/compute_hostkeys

Compute hostkeys