created librarian python core, with Librarian class and placeholders for the save/load/list functions.
created librarian python core, with Librarian class and placeholders for
the save/load/list functions.

jhu-lcsr/sp_segmenter,jhu-lcsr/sp_segmenter,jhu-lcsr/sp_segmenter,ready-robotics/costar_stack,jhu-lcsr/sp_segmenter