ipython/ipython — pull request #6811 by jfrazelle (2014-10-29 21:25:34+00:00)
Title: Update Dockerfile.

I was in the market for an ipython image &
figured while I was here I should update yours :)

Fixed to not use `apt-get upgrade` &
`apt-get update` is not on a single line
re: dockerfile best practices
https://docs.docker.com/articles/dockerfile_best-practices/

Signed-off-by: Jessica Frazelle