stuff with notifications: fixed last notification error and deleting viewed notifications
Merge remote-tracking branch 'origin/eric' into bala-2

Conflicts:
	ParseStarterProject/FriendTableViewController.swift
	ParseStarterProject/HomeFeedController.swift
	ParseStarterProject/MyPlayground.playground/section-1.swift
	ParseStarterProject/ServerInteractor.swift
	ParseStarterProject/SettingsViewController.swift
fixed merge bugs + got some issue with friends/deletes working
weird error involving a mandatory nslog statement