Python 3.2 builds failing

[hugovk]

For example:
https://travis-ci.org/python-pillow/pillow-wheels/builds/103963385

/tmp/tmp88uwda/pip.zip/pip/_vendor/pkg_resources/__init__.py:87: UserWarning: Support for Python 3.0-3.2 has been dropped. Future versions will fail here.
Traceback (most recent call last):
  File "downloads/get-pip.py", line 19033, in <module>
    main()
  File "downloads/get-pip.py", line 194, in main
    bootstrap(tmpdir=tmpdir)
  File "downloads/get-pip.py", line 82, in bootstrap
    import pip
  File "/tmp/tmp88uwda/pip.zip/pip/__init__.py", line 15, in <module>
  File "/tmp/tmp88uwda/pip.zip/pip/vcs/mercurial.py", line 9, in <module>
  File "/tmp/tmp88uwda/pip.zip/pip/download.py", line 35, in <module>
  File "/tmp/tmp88uwda/pip.zip/pip/utils/ui.py", line 15, in <module>
  File "/tmp/tmp88uwda/pip.zip/pip/_vendor/progress/bar.py", line 48
    empty_fill = u'∙'
                      ^
SyntaxError: invalid syntax
Failed to install pip

Here's a setuptools commit that contains the warning "Support for Python 3.0-3.2 has been dropped. Future versions will fail here."
https://bitbucket.org/pypa/setuptools/commits/1cbe02d87fa9b23c3798ef45f3e80e6c75426452

And then, perhaps coincidentally, pip fails to install. See this report and workaround: pypa/pip#3390 (comment)

I think this installation stuff comes from https://github.com/MacPython/terryfy, @matthew-brett please can you have a look?

It looks like two things are needed: first, fix pip installation (now). Second, pin setuptools to some 18.x release (for later).