Update to 5.7:

---
5.7
---

* Issue #240: Based on real-world performance measures against 5.4, zip
  manifests are now cached in all circumstances. The
  ``PKG_RESOURCES_CACHE_ZIP_MANIFESTS`` environment variable is no longer
  relevant. The observed "memory increase" referenced in the 5.4 release
  notes and detailed in Issue #154 was likely not an increase over the status
  quo, but rather only an increase over not storing the zip info at all.

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5.6
---

* Issue #242: Use absolute imports in svn_utils to avoid issues if the
  installing package adds an xml module to the path.

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5.5.1
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* Issue #239: Fix typo in 5.5 such that fix did not take.

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5.5
---

* Issue #239: Setuptools now includes the setup_requires directive on
  Distribution objects and validates the syntax just like install_requires
  and tests_require directives.

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