Track lastServerCall per handler

package.json

@@ -65,7 +65,7 @@
         "c9.ide.language.javascript.eslint": "#3ec4557969",
         "c9.ide.language.javascript.tern": "#8233331bc9",
         "c9.ide.language.javascript.infer": "#8478e3c702",
-        "c9.ide.language.jsonalyzer": "#78c46ad555",
+        "c9.ide.language.jsonalyzer": "#eac2bfd2c3",
         "c9.ide.collab": "#30efed939e",
         "c9.ide.local": "#a6e689e33b",
         "c9.ide.find": "#e33fbaed2f",