Removed the points iterator in PersistenceDaigram; replaced it with a __iter__ method. Got rid of some python code in __init__.py, since it was not needed with the above change. Changed the docs to reflect this.

#include <topology/chain.h>
#include "static-persistence.h"

namespace dionysus { 
namespace python   {

typedef     SPersistence::Chain                     VChain;

} }     // namespace dionysus::python