Add pluggable image processing system

Libraries/Image/RCTAssetsLibraryImageLoader.h

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+/**
+ * Copyright (c) 2015-present, 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 "RCTImageLoader.h"
+
+@interface RCTAssetsLibraryImageLoader : NSObject <RCTImageURLLoader>
+
+@end
+
+@interface RCTBridge (RCTAssetsLibraryImageLoader)
+
+/**
+ * The shared Assets Library image loader
+ */
+@property (nonatomic, readonly) RCTAssetsLibraryImageLoader *assetsLibraryImageLoader;
+
+/**
+ * The shared asset library instance.
+ */
+@property (nonatomic, readonly) ALAssetsLibrary *assetsLibrary;
+
+@end