* Extend Issue 197 workaround to include all Python 3 versions prior to 3.2.2.
3.7.1
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* Issue 213: Use legacy StringIO behavior for compatibility under pbr. * Issue 218: Setuptools 3.8.1 superseded 4.0.1, and 4.x was removed from the available versions to install.
3.7
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* Issue 193: Improved handling of Unicode filenames when building manifests.
3.6
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* Issue 203: Honor proxy settings for Powershell downloader in the bootstrap routine.
3.5.2
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* Issue 168: More robust handling of replaced zip files and stale caches. Fixes ZipImportError complaining about a 'bad local header'.
3.5.1
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* Issue 199: Restored ``install._install`` for compatibility with earlier NumPy versions.