Iss #152 - fixed query editor.

Query editor now use app/plugins/sdk for work. Fixed controller
and template.

plugins/datasource-zabbix/addMetricFunction.js

@@ -98,7 +98,7 @@ function (angular, _, $, metricFunctions) {
         submenu: _.map(list, function(value) {
           return {
             text: value.name,
-            click: "addFunction('" + value.name + "')",
+            click: "ctrl.addFunction('" + value.name + "')",
           };
         })
       };