Merge pull request #931 from manojmahapatra/patch1

updated comments for init methods

Sources/ImageCache.swift

@@ -131,8 +131,6 @@ open class ImageCache {
                       the `.cachesDirectory` in of your app will be used.
     - parameter diskCachePathClosure: Closure that takes in an optional initial path string and generates
                       the final disk cache path. You could use it to fully customize your cache path.
-    
-    - returns: The cache object.
     */
     public init(name: String,
                 path: String? = nil,

Sources/ImageDownloader.swift

@@ -284,8 +284,6 @@ open class ImageDownloader {
     Init a downloader with name.
     
     - parameter name: The name for the downloader. It should not be empty.
-    
-    - returns: The downloader object.
     */
     public init(name: String) {
         if name.isEmpty {

Sources/ImagePrefetcher.swift

@@ -86,8 +86,6 @@ public class ImagePrefetcher {
      - parameter progressBlock:     Called every time an resource is downloaded, skipped or cancelled.
      - parameter completionHandler: Called when the whole prefetching process finished.
      
-     - returns: An `ImagePrefetcher` object.
-     
      - Note: By default, the `ImageDownloader.defaultDownloader` and `ImageCache.defaultCache` will be used as 
      the downloader and cache target respectively. You can specify another downloader or cache by using a customized `KingfisherOptionsInfo`.
      Both the progress and completion block will be invoked in main thread. The `CallbackDispatchQueue` in `optionsInfo` will be ignored in this method.
@@ -112,9 +110,7 @@ public class ImagePrefetcher {
      - parameter options:           A dictionary could control some behaviors. See `KingfisherOptionsInfo` for more.
      - parameter progressBlock:     Called every time an resource is downloaded, skipped or cancelled.
      - parameter completionHandler: Called when the whole prefetching process finished.
-     
-     - returns: An `ImagePrefetcher` object.
-     
+
      - Note: By default, the `ImageDownloader.defaultDownloader` and `ImageCache.defaultCache` will be used as
      the downloader and cache target respectively. You can specify another downloader or cache by using a customized `KingfisherOptionsInfo`.
      Both the progress and completion block will be invoked in main thread. The `CallbackDispatchQueue` in `optionsInfo` will be ignored in this method.