Geobasespypy

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* Upgrade setuptools to 20.0

* Upgrade wheel to 0.29.0

* Fix an error where virtualenv didn't pass in a working ssl certificate for
pip, causing "weird" errors related to ssl.

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* Homogenize drive letter casing for both prefixes and filenames. :issue:`858`

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* Upgrade setuptools to 19.6.2

* Revert ac4ea65; only correct drive letter case.
Fixes :issue:`856`, :issue:`815`

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* Upgrade setuptools to 19.6.1

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* Upgrade setuptools to 19.6

* Supress any errors from `unset` on different shells (:pull:`843`)

* Normalize letter case for prefix path checking. Fixes :issue:`837`

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* Upgrade from pip 8.0.0 to 8.0.2.

* Fix the default of ``--(no-)download`` to default to downloading.