- Adjusted the now-clearer error.
- Removed error log message as that's now in the actual error message

Previously:

    The constraint, 1.6.6, is not consistent with the requirement, 'Django>=1.7'.
    While:
      Updating django.
    Error: Bad constraint 1.6.6 Django>=1.7

Now:

    While:
      Installing django.
    Error: The requirement ('Django>=1.7') is not allowed by your [versions] constraint (1.6.6)

The original message said "bad constraint". No, the constraint is not
necessarily bad. It only conflicts with some other package's requirement.

The new message tells you that "constraint" means "your own [versions]
list".

[ci skip]

[ci skip]

Fix #279 on windows

[ci skip]

[ci skip]

Same as #277, but with test and changelog entry

The base dir ("develop = .") should be relativized, too, but currently isn't.
This test proves that it doesn't work (it will be fixed by #277)

For example when you use the develop option like:

  [buildout]
  develop= .

Fixed winbot test. Didn't think about -script and .exe

See http://winbot.zope.org/builders/zc_buildout_dev%20py_270_win64%20master/builds/1149/steps/test/logs/stdio

[ci skip]

[ci skip]

distutils scripts for develoment eggs are also installed

-x means "do not install scripts" and we're doing that now.
So the test needed to be adjusted.

Upgraded version pins

This only impacts testing.
Note that
VersionConflict: (zc.recipe.testrunner 2.0.0 (/Users/reinout/.buildout/eggs/zc.recipe.testrunner-2.0.0-py2.7.egg), Requirement.parse('zc.recipe.testrunner==1.3.0'))
means you have to remove .installed.cfg. Pinning a recipe version in a 'recipe=' line isn't handy.

fix for win32 '#!"python"' vs '#!python' shebang

A pip issue prevents installation of wheels with ``.egg`` in their name...

[ci skip]

[ci skip]

Wheel support also for zc.recipe.egg