support dynamic bower path

MediaBrowser.Api/Images/ImageService.cs

@@ -637,7 +637,11 @@ namespace MediaBrowser.Api.Images
                 ResponseHeaders = headers,
                 ContentType = imageResult.Item2,
                 IsHeadRequest = isHeadRequest,
-                Path = imageResult.Item1
+                Path = imageResult.Item1,
+
+                // Sometimes imagemagick keeps a hold on the file briefly even after it's done writing to it.
+                // I'd rather do this than add a delay after saving the file
+                FileShare = FileShare.ReadWrite
             });
         }