Merge pull request #146 from wordpress-mobile/andrewdmontgomery/renam…

…e-ImageCache

Use Gravatar.ImageCaching protocol instead of defining our own

Sources/WordPressUI/Extensions/UIImageView+Networking.swift

@@ -1,6 +1,6 @@
 import Foundation
 import UIKit
-import protocol Gravatar.GravatarImageCaching
+@_exported import protocol Gravatar.ImageCaching
 
 #if SWIFT_PACKAGE
 import WordPressUIObjC
@@ -173,11 +173,6 @@ public extension UIImageView {
     }
 }
 
-public protocol ImageCaching: GravatarImageCaching {
-    func setImage(_ image: UIImage, forKey key: String)
-    func getImage(forKey key: String) -> UIImage?
-}
-
 public class ImageCache: ImageCaching {
     private let cache = NSCache<NSString, UIImage>()