Update to Xcode 6.1 Beta 2 - Swift 1.1

- From the release notes:

"The RawRepresentable protocol that enums with raw types implicitly conform to
has been redefined to take advantage of failable initializers. The
fromRaw(RawValue) static method has been replaced with an initializer
init?(rawValue: RawValue), and the toRaw() method has been replaced with a
rawValue property."