Package for building DMG installers from pip requirements

Hi,

I'd very much like your feedback on a utility I've written to make OSX
installers from wheels.

For my own course, and for matplotlib, I wanted to make an double click OSX
installer which would install a series of requirements into Python.org Python.

As usual, I got a lot of  useful thinking on this from Min Ragan-Kelly
of IPython fame.

I've written an package that automates building the installer:

https://github.com/matthew-brett/wheels2dmg

There are some examples in the README, but the basic idea is:

    wheels2dmg scipy-stack 1.0 scipy matplotlib ipython[notebook] \
        pandas numexpr sympy --python-version 2.7.8

This uses pip to download wheels for the stated requirements, packages them up
into a 'wheels' directory, creates an OSX ``.pkg`` installer that will install
the wheels using pip, and puts this all into a ``.dmg`` disk image with a
suitable README, and a link for downloading Python.org Python.

The generated README covers installing into Macports and Homebrew.

My hope is that this makes it easy for people who want to provide a whole
stack to provide a ``.dmg`` installer that does the right thing in terms of
updating dependencies.

I'd love to get any feedback on whether this works for people, and missing
features.

Cheers,

Matthew
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