MUOperatingSystem: add a mechanism for easily querying the OS version.
iOS 7 UI: work in progress.
MUMessagesViewController: iOS 7 fixes.
MUConnectionController, MUHorizontalFlipTransitionDelegate: fix horizontal flip transition on iOS 7.
MUMessagesViewController: visual tweaks for iOS 7.
MUCertificatePreferencesViewController: fix detail disclosure accessory button on iOS 7.
MUCountryServerListController: fix look and feel on iOS 7.
MUServerViewController, MUMessageRecipientViewController: fix cell indentation on iOS 7 via newly added MUServerTableViewCell.
MUMessageRecipientViewController: fix off-by-one error caused by manual user index calculation.
Add iOS 7 launch screen images and icons.
MUMessageBubbleTableViewCell, Resources: adjust chat bubbles for iOS 7 look.