Zc.sourcefactory

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- Fixed bug in __new__ of factories that would disallow subclasses to use
constructors that expect a different signature. (Thanks to Sebastian
Wehrmann for the patch.)

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- Fixed scalability bug caused by missing __nonzero__ on ValueMappingSource

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- Fixed scalability bug caused by missing __nonzero__ on BasicSourceFactory

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- Added class-level defaults for attributes that are declared in the
interfaces to not have the Zope 2 security machinery complain about
them.

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- Fixed a bug in the contextual token policy that was handling the
resolution of values for a given token incorrectly.

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- Added a contextual token policy interface that allows getToken and
getValue to access the cotext for contextual sources.

- Added a contextual term policy interface that allows createTerm and
getTitle to access the context for contextual sources.

- Added compatibility for Zope 3.2 and Zope 2.9 (via Five 1.3)