Address for Handling Public, Follower and User defined list

* address.py: Address for public, followers and user defined lists.
* note.py: By default to and cc sends to user followers. You can also
  change the default behavior by calling set_cc and set_to functions
  respectively.
* person.py: Defines function for getting user defined list. (This
  requires more testing.)
* pypump.py: Added changes to include Address.