Added syncing of files with disk when a user explicitly closes them

package.json

@@ -71,7 +71,7 @@
         "c9.ide.language.javascript.infer": "#b9c2e4bdb8",
         "c9.ide.language.jsonalyzer": "#72954f8da1",
         "c9.ide.language.codeintel": "#4e0a272229",
-        "c9.ide.collab": "#b46916087a",
+        "c9.ide.collab": "#15c7cfebf8",
         "c9.ide.local": "#9169fec157",
         "c9.ide.find": "#a2dfc3e306",
         "c9.ide.find.infiles": "#488db22ee1",