Update Umbraco.gitignore

Add ImageProcessor cached files and nuget package updates

Umbraco.gitignore

 # Note: VisualStudio gitignore rules may also be relevant
 
+# =========================
+# Umbraco
+# =========================
 # Ignore unimportant folders generated by Umbraco
 **/App_Data/ClientDependency/
 **/App_Data/ExamineIndexes/
 **/App_Data/Logs/
 **/App_Data/[Pp]review/
 **/App_Data/TEMP/
-Cached/
+**/App_Data/NuGetBackup/
+**/App_Data/FeedCache/
+**/App_Data/courier/revisions/
+**/App_Data/courier/cache/
+**/App_Data/umbraco.licensing.log.txt
+**/App_Data/*.udt
+**/aspnet_client/
 
 # Ignore Umbraco content cache file
 **/App_Data/umbraco.config
@@ -15,3 +24,9 @@ Cached/
 # Make sure to include details from VisualStudio.gitignore BEFORE this
 !**/App_Data/[Pp]ackages/
 !**/[Uu]mbraco/[Dd]eveloper/[Pp]ackages
+
+# =========================
+# ImageProcessor DiskCache 
+# =========================
+**/App_Data/cache/
+Cached/