Bump kernel gateway to 0.3.1

Also change CMD vs ENTRYPOINT to match what minimal-notebook
and some major official Docker images do (redis, mysql, nginx, ...)
by having the jupyter kernelgateway in the CMD, and just tini --
in the entrypoint

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Notebook 4.1.x

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Also fix copyright headers on various files

Remove build deps from minimal-kernel image

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* Use setuptools to get modern pip (debian packaged pip stops
  working after requests gets updated)
* Don't use wget to fetch tini, use Python!

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* Remove SHELL env var and leftover USER nobody
* Install wget for tini then immediately uninstall it
* Install build-essentials and python3-dev for tornado speed up
  then immediately uninstall them

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First time we've added a stack under the new versioning scheme

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New docker stack for a headless kernel

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New docker stack for a headless kernel.  It uses the new kernel gateway to provide websocket access without exposing the whole notebook UI.

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Add texlive-generic-recommended to fix PDF export

Fixes #99

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Make jovyan the default user for the docker cmd

Install libxrender1 to appease matplotlib et al.

Bite the bullet and preinstall it so that plotting libs that default
to using desktop rendering just work (matplotlib, ggplot, ...)
out of the box without having to get configuration right beforehand
(e.g., %matplotlib inline ahead of matplotlib import)

Only adds ~100k to the image size

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make-deploy example: run stacks on docker-machines

* Fix missing export on virtualbox-vm settings
* Note about busted make on ubuntu 14.04
* Pin jupyter/minimal-notebook version so example always works
* Bit more of a hint about additional parameters

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* Switch to jovyan at the end of every Dockerfile
* Document --user root requirement for NB_UID and GRANT_SUDO flags

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Cannot use custom output path when renewing, so do not use it at all

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Bump r-irkernel to 0.5 to fix zmq issue

Requires r-rmarkdown=0.8, r-devtools=1.9, r-tidyr=0.3 in r-notebook

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Configure en_US.UTF-8

Create jovyan user before conda install

Fixes #82

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