Added SFAuthorization

Added SFAuthorization.init()

Added SFAuthorization.authorization() -> AnyObject! [class]

Added SFAuthorization.authorizationRef() -> AuthorizationRef

Added SFAuthorization.authorizationWithFlags(AuthorizationFlags, rights: UnsafePointer<AuthorizationRights>, environment: UnsafePointer<AuthorizationEnvironment>) -> AnyObject! [class]

Added SFAuthorization.init(flags: AuthorizationFlags, rights: UnsafePointer<AuthorizationRights>, environment: UnsafePointer<AuthorizationEnvironment>)

Added SFAuthorization.invalidateCredentials()

Added SFAuthorization.obtainWithRight(AuthorizationString, flags: AuthorizationFlags, error: NSErrorPointer) -> Bool

Added SFAuthorization.obtainWithRights(UnsafePointer<AuthorizationRights>, flags: AuthorizationFlags, environment: UnsafePointer<AuthorizationEnvironment>, authorizedRights: UnsafeMutablePointer<UnsafeMutablePointer<AuthorizationRights>>, error: NSErrorPointer) -> Bool