Merge pull request #1660 from quadroid/patch-1

JetBrains IDEs: add shelf (VCS -> Shelve changes... menu)

Global/JetBrains.gitignore

@@ -10,6 +10,7 @@
 # .idea/workspace.xml
 # .idea/tasks.xml
 # .idea/dictionaries
+# .idea/shelf
 
 # Sensitive or high-churn files:
 # .idea/dataSources.ids