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.

add_subdirectory			(alphashapes)
#add_subdirectory			(ar-vineyard)
add_subdirectory			(cech-complex)
add_subdirectory			(consistency)
add_subdirectory			(cohomology)
add_subdirectory			(fitness)
add_subdirectory			(pl-functions)
add_subdirectory			(triangle)
add_subdirectory			(poincare)
add_subdirectory			(rips)