Restrictedpython

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- Add name check for names assigned during imports using the
``from x import y`` format.

- Add test for name check when assigning an alias using multiple-context
``with`` statements in Python 2.7.

- Add tests for protection of the iterators for dict and set comprehensions
in Python 2.7.

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- Remove support for ``DocumentTemplate.sequence`` - this is handled in the
DocumentTemplate package itself.

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- Remove a testing dependency on ``zope.testing``.

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- Add tests for ``Utilities`` module.

- Filter DeprecationWarnings when importing Python's ``sets`` module.

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- Drop legacy support for Python 2.1 / 2.2 (``__future__`` imports
of ``nested_scopes`` / ``generators``.).