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=/sandbox-branches/birbacher/propertymap-functormap/boost/property_map/; revision=77438
Added new empty file.

svn path=/sandbox-branches/birbacher/propertymap-functormap/boost/property_map/; revision=77439
Empty skeleton for functor_property_map.

svn path=/sandbox-branches/birbacher/propertymap-functormap/boost/property_map/; revision=77440
Added concept check for new functor_property_map.
Test fails.

svn path=/sandbox-branches/birbacher/propertymap-functormap/libs/property_map/; revision=77441
Disable test.

svn path=/sandbox-branches/birbacher/propertymap-functormap/libs/property_map/; revision=77462
Test for boost::function as property map.

svn path=/sandbox-branches/birbacher/propertymap-functormap/libs/property_map/; revision=77463
Added test for property map of boost::function using reference return type.

svn path=/sandbox-branches/birbacher/propertymap-functormap/libs/property_map/; revision=77464
Implemented property map for boost::function.

svn path=/sandbox-branches/birbacher/propertymap-functormap/boost/property_map/; revision=77465
Added test for boost::function1 as property map.

svn path=/sandbox-branches/birbacher/propertymap-functormap/libs/property_map/; revision=77466
Added property map implementation for boost::function1.

svn path=/sandbox-branches/birbacher/propertymap-functormap/boost/property_map/; revision=77467