Added a class to serialize item objects, and their contents to JSON, and
write as a file to local storage.   Added method to de-serialize items, and repopulate listview.  Persistence of Listview complete.

Reorganized other class files.   Imported Parse Library for future UI Signup flow.
Merge pull request #3 from wrparrish/Serialize

Added a class to serialize item objects, and their contents to JSON, and