Implemented basic tabbed UI.

Added UIViewControllers for five main tabs.
Added tab icons.
Removed unnecessary resource files.
Initial UI work on Settings Table View.
Refined Settings TableView UI.
Added UI for Draw Settings.
Implemented user settings.
Implemented share and feedback email within Settings.
Added HelpIndexTableViewController to MainStoryboard.
Sign out button triggers AlertView asking user to confirm or dismiss sign out action.
Added TODO items.
Merging initial UI work into Master branch.