Start Homework 252

* Use SQLite data store to add, delete & persist ToDo's.
* Use ListFragment to display list of ToDo's to user.
* Selecting a ToDo in the list causes the ToDo to also be displayed in
the large Detail view.
Continue Homework 252

* Add icons for add and delete to the action bar.
* Clicking the add icon causes the "Add a ToDo" dialog to appear.
* Cancel button just destroys the dialog,
* OK button causes input text to be added to the SQLite db and be
displayed in the ToDo List Fragment.
Homework 252 continued

* Small changes.
Yet More HW 252 changes

* Add ability to do layout differently based on phone or tablet.
* Fixed the text color in the Add ToDo dialog.
Final Submission - HW 252