fix linting errors

lib/6to5/polyfill.js

@@ -1,4 +1,4 @@
-/* jshint newcap: false */
+/* jshint newcap: false, freeze: false */
 
 var ensureSymbol = function (key) {
   Symbol[key] = Symbol[key] || Symbol(key);

lib/6to5/transformation/modules/amd.js

@@ -51,7 +51,7 @@ AMDFormatter.prototype.transform = function (ast) {
 
 AMDFormatter.prototype.getModuleName = function () {
   if (this.file.opts.amdModuleIds) {
-    return CommonJSFormatter.prototype.getModuleName.apply(this, arguments);
+    return DefaultFormatter.prototype.getModuleName.apply(this, arguments);
   } else {
     return null;
   }

lib/6to5/transformation/modules/common.js

@@ -42,7 +42,7 @@ CommonJSFormatter.prototype.export = function (node, nodes) {
     var templateName = "exports-default-module";
 
     // exports = module.exports = VALUE;
-    if (this.hasNonDefaultExports) templateName = "exports-default-module-override"
+    if (this.hasNonDefaultExports) templateName = "exports-default-module-override";
 
     var assign = util.template(templateName, {
       VALUE: this._pushStatement(declar, nodes)

lib/6to5/transformation/transformers/es7-generator-comprehension.js

@@ -6,7 +6,7 @@ exports.ComprehensionExpression = function (node) {
 
   var body = [];
   var container = t.functionExpression(null, [], t.blockStatement(body), true);
-  container._aliasFunction = true
+  container._aliasFunction = true;
 
   body.push(arrayComprehension._build(node, function () {
     return t.expressionStatement(t.yieldExpression(node.body));

lib/6to5/transformation/transformers/spec-block-hoist-functions.js

@@ -1,5 +1,4 @@
 var t = require("../../types");
-var _ = require("lodash");
 
 exports.BlockStatement = function (node, parent) {
   if (t.isFunction(parent)) return;