updates to actuator.py and serail_controller.py - I havee fixed these issues like 3 times.  hopefully no more.

Update install_software.md

added assertions for add parts method arguments

Update docs to point to the latest Tensorflow version in osx

Make tensorflow/tensorflow-gpu install clearer

typo error

Update get_driving.md

I've got the error "createcar: error: unrecognized arguments: --path".