fix setuptools don't search download location in dependency_links bug
Added comment emphasizing the importance of bdist_wheel. Using Python 3.3 fixes #143.

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extra : amend_source : 46787fd35452f54da1a8afd2bf8a30dff920d8a2
Use io.open() instead of codecs.open().
(builtins.open() is io.open() in Python 3.)
Merged in menghan/setuptools (pull request #30)

Setuptools now honors all dependency_links and not just the first one that was supplied.
Update changelog; Fixes #128.