added sortByName function (thx @jippi)

src/app/services/graphite/gfunc.js

@@ -101,6 +101,11 @@ function (_) {
     defaultParams: [3]
   });
 
+  addFuncDef({
+    name: 'sortByName',
+    category: categories.Special
+  });
+
   addFuncDef({
     name: 'aliasByMetric',
     category: categories.Special,