Acquisition

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- Bump dependency on ``ExtensionClass`` to match current release.

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- Skip readme.rst tests when tests are run outside a source checkout.

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- Include ``*.rst`` files in the release.

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- Tolerate Unicode attribute names (ASCII only). LP 143358.

- Make module-level ``aq_acquire`` API respect the ``default`` parameter.
LP 1387363.

- Don't raise an attribute error for ``__iter__`` if the fallback to
``__getitem__`` succeeds. LP 1155760.

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- Added trove classifiers to project metadata.

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- Raise `RuntimeError: Recursion detected in acquisition wrapper` if an object
with a `__parent__` pointer points to a wrapper that in turn points to the
original object.

- Prevent wrappers to be created while accessing `__parent__` on types derived
from Explicit or Implicit base classes.