VersionConflict in easy_install now causes TypeError

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Originally reported by: jaraco (Bitbucket: jaraco, GitHub: jaraco)

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Probably implicated in the fix for #268, a VersionConflict during an install now raises an exception:

Traceback (most recent call last):
  File "c:\python\scripts\easy_install.pya", line 9, in <module>
    load_entry_point('setuptools==7.0', 'console_scripts', 'easy_install')()
  File "C:\Program Files\Python34\lib\site-packages\setuptools-7.0-py3.4.egg\setuptools\command\easy_install.py", line 2147, in main
  File "C:\Program Files\Python34\lib\site-packages\setuptools-7.0-py3.4.egg\setuptools\command\easy_install.py", line 2133, in with_ei_usage
  File "C:\Program Files\Python34\lib\site-packages\setuptools-7.0-py3.4.egg\setuptools\command\easy_install.py", line 2150, in <lambda>
  File "C:\Program Files\Python34\lib\distutils\core.py", line 148, in setup
    dist.run_commands()
  File "C:\Program Files\Python34\lib\distutils\dist.py", line 955, in run_commands
    self.run_command(cmd)
  File "C:\Program Files\Python34\lib\distutils\dist.py", line 974, in run_command
    cmd_obj.run()
  File "C:\Program Files\Python34\lib\site-packages\setuptools-7.0-py3.4.egg\setuptools\command\easy_install.py", line 370, in run
  File "C:\Program Files\Python34\lib\site-packages\setuptools-7.0-py3.4.egg\setuptools\command\easy_install.py", line 613, in easy_install
  File "C:\Program Files\Python34\lib\site-packages\setuptools-7.0-py3.4.egg\setuptools\command\easy_install.py", line 645, in install_item
  File "C:\Program Files\Python34\lib\site-packages\setuptools-7.0-py3.4.egg\setuptools\command\easy_install.py", line 704, in process_distribution
TypeError: not enough arguments for format string

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• Bitbucket: https://bitbucket.org/pypa/setuptools/issue/281

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Original comment by msabramo (Bitbucket: msabramo, GitHub: msabramo):

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I'll try to take a look soon. Fairly loaded at the moment though.

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Original comment by oxtopus (Bitbucket: oxtopus, GitHub: oxtopus):

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I ran into this one, too, and the TypeError was really misleading. In one case VersionConflict was raised with two args, and in another, a single str that was causing problems with the str format in the exception handler.

Proposed solution at https://bitbucket.org/pypa/setuptools/pull-request/113/handle-versionconflict-special-case-when/diff

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Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Issue #324 was marked as a duplicate of this issue.

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Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Add test capturing expectation when dependencies conflict during resolve. Fixes #281