Lovely.buildouthttp

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- added support for zc.buildout versions >= 2.0.0 (monkey patch of urlopener
has changed)

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- added python3 compatibility

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- fix compatibility issues for setuptools 0.7 and later.

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- the User-Agent header isn't dropped anymore because the Github API requires
it.

- prompt for password if it's not in the .httpauth file

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- also check the whitelist for github downloads (not just find-links)

- more testing

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- allow optional whitelist for github repositories (see README)