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Pin versions in pip.

Problematic code:

FROM python:3.4
RUN pip install django
RUN pip install https://github.com/Banno/carbon/tarball/0.9.x-fix-events-callback

Correct code:

FROM python:3.4
RUN pip install django==1.9
RUN pip install git+https://github.com/Banno/carbon@0.9.15

Rationale:

https://docs.docker.com/develop/develop-images/instructions/#apt-get

Version pinning forces the build to retrieve a particular version regardless of what’s in the cache. This technique can also reduce failures due to unanticipated changes in required packages.