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
Added new empty file.
Empty skeleton for functor_property_map.
Added concept check for new functor_property_map.
Test fails.
Disable test.
Test for boost::function as property map.
Added test for property map of boost::function using reference return type.
Implemented property map for boost::function.
Added test for boost::function1 as property map.
Added property map implementation for boost::function1.