Friends picker (in progress)
Friend photo round borders, some minor fixes
Friends picker delegate
creating Debt class and Controller
creating UI for Debts
UI for Debts
UI for Debts. add checkboxes
UI for Debts. refresh sum
Picking friends for events and purchases, UI fixes, friends on event displayed
missed files
Merge branch 'feature/friendsPicker' into develop

Conflicts:
	Pods/Pods.xcodeproj/project.pbxproj
Merge branch 'develop' into feature/debtCalculation

Conflicts:
	Owe.xcodeproj/project.pbxproj
	Owe/Classes/Controller/Events/OWEventsViewController.m
	Owe/Classes/Controller/Purchases/OWPurchaseDetailViewController.m
	Owe/Classes/Controller/Purchases/OWPurchaseViewController.m
	Owe/Classes/View/Base.lproj/Main.storyboard
Merge branch 'feature/debtCalculation' into develop