WIP: Implements 'docker upload'
Merge branch 'master' into 'docker-upload'

Conflicts:
	reprounzip-docker/reprounzip/unpackers/docker.py
Removes docker_escape(), Docker is broken anyway

Docker's parser is very broken, I don't know if there is anyway for
spaces to work.
Implements uploading via Dockerfile autogeneration

This is very hacky and inefficient since it creates a new layer each
time the 'upload' command is used.
Adds functional test for 'docker upload'
Merge branch 'docker-upload' into 'master'
Updates CHANGELOG