iOS: remove unused xib files
Issue #194 : change all background color from light blue to white
iOS: code refactoring, a class should have only one designated initializer
iOS: use native navigationItem’s title instead of PacoTitleView to enable title length flexible, code refactoring
Issue #194 : change table cell’s text color to blue so that cells look clickable.
Issue #194 : make title larger on navigation bar of the main view controller
Issue #194 : adjust button’s text size for iOS 7