Added code to expose the persistence_diagram class, the bottleneck_distance function and the point class to python. Most of the commonly used methods for each class have been exported. The constructor for point now requires that a data argument be provided along with x and y coord. This needs to be made optional. The constructor for persistence_diagram could possibly be rewritten as well.

set							(targets						
							 ar-vineyard)
	
add_definitions				(${cgal_cxxflags})
foreach 					(t ${targets})
	add_executable			(${t} ${t}.cpp ${external_sources})
	target_link_libraries	(${t}   ${libraries} ${cgal_libraries} 
                                    ${Boost_SIGNALS_LIBRARY} 
                                    ${Boost_PROGRAM_OPTIONS_LIBRARY})
endforeach 					(t)