Fixes lint warnings that are blocking test run

lib/6to5/transformation/transformers/es6-classes.js

@@ -1,6 +1,5 @@
 var ReplaceSupers = require("../helpers/replace-supers");
 var nameMethod    = require("../helpers/name-method");
-var traverse      = require("../../traverse");
 var util          = require("../../util");
 var t             = require("../../types");
 

lib/6to5/transformation/transformers/react.js

@@ -226,7 +226,7 @@ var addDisplayName = function (id, call) {
   var safe = true;
 
   for (var i = 0; i < props.length; i++) {
-    prop = props[i];
+    var prop = props[i];
     if (t.isIdentifier(prop.key, { name: "displayName" })) {
       safe = false;
       break;