Update builds with more dead code removed.

Former-commit-id: 4e1932fcfc89725071a107dcd1aeec2d025b580a

dist/lodash.js

@@ -93,7 +93,6 @@
       arrayClass = '[object Array]',
       boolClass = '[object Boolean]',
       dateClass = '[object Date]',
-      errorClass = '[object Error]',
       funcClass = '[object Function]',
       numberClass = '[object Number]',
       objectClass = '[object Object]',
@@ -444,8 +443,7 @@
     var arrayRef = [];
 
     /** Used for native method references */
-    var objectProto = Object.prototype,
-        stringProto = String.prototype;
+    var objectProto = Object.prototype;
 
     /** Used to restore the original `_` reference in `noConflict` */
     var oldDash = context._;
@@ -466,14 +464,13 @@
         getPrototypeOf = reNative.test(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf,
         hasOwnProperty = objectProto.hasOwnProperty,
         push = arrayRef.push,
-        propertyIsEnumerable = objectProto.propertyIsEnumerable,
         setImmediate = context.setImmediate,
         setTimeout = context.setTimeout,
         toString = objectProto.toString;
 
     /* Native method shortcuts for methods with the same name as other `lodash` methods */
     var nativeBind = reNative.test(nativeBind = toString.bind) && nativeBind,
-        nativeCreate = reNative.test(nativeCreate =  Object.create) && nativeCreate,
+        nativeCreate = reNative.test(nativeCreate = Object.create) && nativeCreate,
         nativeIsArray = reNative.test(nativeIsArray = Array.isArray) && nativeIsArray,
         nativeIsFinite = context.isFinite,
         nativeIsNaN = context.isNaN,