Update deps to latest supported & minor cleanup #25
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This pull request updates all of the python dependencies to the latest supported by Python 2.7 & removes some unneeded deps to reduce unneeded image sizing.
I did try to perform a full upgrade to python 3, but I ended up running into issues that weren't very obvious to me.
I'll likely look into those at a later date, but this at least gets the docker image a little bit closer to being up-to-date.