tab controller
working on listing cell
refresh button
test
list controller added
Cleaned up main
Created base listing class,  UPMListing. Also added documentation.
Added all listing classes
Fixed marking
Removed main storyboard
Merge remote-tracking branch 'origin/master' into listingClasses
deleted listing stuff
Merge branch 'Sell'
Merged stuff
Merge branch 'Sell'
Merge branch 'Sell'
Merge branch 'Sell'
Merge branch 'Sell'
Merge branch 'Sell'
Merge branch 'Sell'