Ensure docker image build succeeds

With ubuntu 14.04.1 the docker build fails
- add ubuntu version
- remove sudo
- remove 'pip install --upgrade' distribute
Merge branch 'patch-1' of https://github.com/t3chn0m4g3/glastopf into t3chn0m4g3-patch-1

Conflicts:
	Dockerfile
Merge branch 't3chn0m4g3-patch-1'