Small performance improvement and jitter output in ms

Improve performance by replacing division /255 with multiplications and adding some pep-8 formatting. Also fixing jitter output to be in ms

Update get_driving.md

Update Ip-Adress change to Hostname

Dev

* unrolling the salient method in keras-vis into 2 parts
* putting the optimizer which can be kept static into the initialization
* also remove unused code and imports

add ~/ to "cd projects" command

Update donkey.md

Simplifying cd to projects dir