Added WindowClosing event to save all progress on exit
Persitence of Customer Orders is working
Optimized JsonExample clearList method which now returns a boolean to
let you know if it was successful.
Added WindowClosing event to save all progress on exit
Persitence of Customer Orders is working
Optimized JsonExample clearList method which now returns a boolean to
let you know if it was successful.  

Merge remote-tracking branch 'origin/master'

Conflicts:
	RetailSystem/resources/suppliers.json