- Add Facebook SDK

- Add PNUser Login

Example/Pods/Bolts/Bolts/Common/BFCancellationToken.h

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+/*
+ *  Copyright (c) 2014, Facebook, Inc.
+ *  All rights reserved.
+ *
+ *  This source code is licensed under the BSD-style license found in the
+ *  LICENSE file in the root directory of this source tree. An additional grant
+ *  of patent rights can be found in the PATENTS file in the same directory.
+ *
+ */
+
+#import <Foundation/Foundation.h>
+
+#import <Bolts/BFCancellationTokenRegistration.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/*!
+ A block that will be called when a token is cancelled.
+ */
+typedef void(^BFCancellationBlock)();
+
+/*!
+ The consumer view of a CancellationToken.
+ Propagates notification that operations should be canceled.
+ A BFCancellationToken has methods to inspect whether the token has been cancelled.
+ */
+@interface BFCancellationToken : NSObject
+
+/*!
+ Whether cancellation has been requested for this token source.
+ */
+@property (nonatomic, assign, readonly, getter=isCancellationRequested) BOOL cancellationRequested;
+
+/*!
+ Register a block to be notified when the token is cancelled.
+ If the token is already cancelled the delegate will be notified immediately.
+ */
+- (BFCancellationTokenRegistration *)registerCancellationObserverWithBlock:(BFCancellationBlock)block;
+
+@end
+
+NS_ASSUME_NONNULL_END