Codebase Overhaul

[ChrisLaganiere]

Refactors entire codebase to

• Initialize views programmatically instead of with a storyboard. I've found that storyboards can be difficult to maintain with multiple developers, and that UI elements are more reusable if initialized programmatically.
• Use auto layout and size classes. Ryff doesn't differentiate between device types anymore, and is ready for iOS 9 multitasking.
• Set up new AVAudioEngine mixer.
• Use cocoapods.
• Update to Swift 2.
• Update codebase for iOS 9.
• Better organize logic.