Pyshop

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- Use requests for xmlrpc queries too.
- validate certificate if https is used
- unified proxies configuration (use environment vars)
- SAWarning/DeprecationWarning removed
- Fix mirroring link for external files

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- Mirror the download_url of the release file
- Handle hiphen and underscore [fizyk]
- Enhance mimetime handling [fizyk]
- Bugfixes and DeprecationWarning removed

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- Fix package version comparison
- Handle bdist_wheel format

To handle the wheel format, (some package like Twisted 13 use it),
for previous install, you must run a migration script like this.

::

$ pyshop_migrate development.ini 0.7.5

The sqlite database file will be altered, YOU MAY backup it before run the
script.

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- Fix local package usage (broken since 0.7.1) [fizyk]

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- Remove all certificates and extra handling for PyPI validation as PyPI now
uses a certificate that can be validated without these. [disko]

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- Remove unused certificates for pypi validation