Cleanup unused var warnings

lib/handlebars/exception.js

@@ -1,7 +1,7 @@
 
 var errorProps = ['description', 'fileName', 'lineNumber', 'message', 'name', 'number', 'stack'];
 
-function Exception(message) {
+function Exception(/* message */) {
   var tmp = Error.prototype.constructor.apply(this, arguments);
 
   // Unfortunately errors are not enumerable in Chrome (at least), so `for prop in tmp` doesn't work.

lib/handlebars/runtime.js

@@ -40,7 +40,7 @@ export function template(templateSpec, env) {
       return partials[name](context, options);
     };
   } else {
-    invokePartialWrapper = function(partial, name, context, helpers, partials, data) {
+    invokePartialWrapper = function(partial, name /* , context, helpers, partials, data */) {
       var result = invokePartial.apply(this, arguments);
       if (result) { return result; }
       throw new Exception("The partial " + name + " could not be compiled when running in runtime-only mode");

lib/handlebars/utils.js

@@ -1,7 +1,6 @@
 import SafeString from "./safe-string";
 
-var toString = Object.prototype.toString,
-    isArray = Array.isArray;
+var isArray = Array.isArray;
 
 var escape = {
   "&": "&",