3.1.3 support is no longer a concern.
Use modern modal presentation methods
Use NSAssert over GTMDevAssert.
Use NSLocalizedString over GTMLocalizedString.
Move GTMDevLog in-house.
Move remaining GTM pieces in, ditch GTM dependency.
Move OTPURLArguments to NSURL.
Semantic cleanups in NSString+OTPURLArguments
Smarter Base32 implementation.
Upgrade nibs to new format
Move to iOS 7 QR detection, bye zxing.
Move root VC initialization into code
Move new auth URL initialization out of nib, bye MainWindow
Use new native scanUnsignedLongLong.
Remove unused prefix header, enable modules.
Migrate to image asset catalog
ARC conversion.
“Modern syntax” conversion.
Clean up project build options.
64-bit readiness.