Merge pull request +14636 from c9/ide-keyboard-pane-navigation

Add keyboard pane navigation as a core plugin

package.json

@@ -85,7 +85,7 @@
         "c9.ide.ace.split": "#0ae0151c78",
         "c9.ide.ace.statusbar": "#3aab0b67e0",
         "c9.ide.ace.stripws": "#042a9936e3",
-        "c9.ide.behaviors": "#db32109ebc",
+        "c9.ide.behaviors": "#6fe68dea3b",
         "c9.ide.closeconfirmation": "#cee4674141",
         "c9.ide.configuration": "#a936df26bb",
         "c9.ide.dialog.wizard": "#7667ec79a8",