Created branch to extend PropertyMap:
add a readable functor map that calls a given functor or function upon lookup.
Ideas from: http://comments.gmane.org/gmane.comp.lib.boost.user/54397
and: http://comments.gmane.org/gmane.comp.lib.boost.user/73358

svn path=; revision=77438
Added new empty file.

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Empty skeleton for functor_property_map.

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Added concept check for new functor_property_map.
Test fails.

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Disable test.

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Test for boost::function as property map.

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Added test for property map of boost::function using reference return type.

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Implemented property map for boost::function.

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Added test for boost::function1 as property map.

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Added property map implementation for boost::function1.

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