[Twisted-Python] woven guard patch and example

[Rich Cavanaugh]

The woven.guard patch attached contains one minor bug fix (changing a
reference in GuardSession.checkExpired from self.site.sessions to
self.guard.sessions). Also, it slightly modifies PerspectiveWrapper to make
using alternate resources for a login page easier.

The example file attached demonstrates using woven.guard with the patch
applied. If anyone wants I can post an example of use without the patch.

rich
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