Update the docker set up for python 3.5. Also updated the README with correct information about the Docker set up both for regular development set up and as relates to the web admin.
Coverage remained the same at 69.675% when pulling 60301e7968207e305f0bace23d9e3b3e3ef56dde on lauralorenz:55-update-docker-image-to-python35 into a625d451e99f7a0ef43fb0fd85e0ecc269e87cdd on bbengfort:develop.
Update the docker set up for python 3.5. Also updated the README with correct information about the Docker set up both for regular development set up and as relates to the web admin.