Don't use "objects" in lib/peg.js

The "objects" module will be removed.

See #442.

lib/peg.js

@@ -1,7 +1,5 @@
 "use strict";
 
-let objects = require("./utils/objects");
-
 let peg = {
   /* PEG.js version (uses semantic versioning). */
   VERSION: "0.10.0",
@@ -29,15 +27,14 @@ let peg = {
 
       for (let stage in passes) {
         if (passes.hasOwnProperty(stage)) {
-          converted[stage] = objects.values(passes[stage]);
+          converted[stage] = Object.keys(passes[stage])
+            .map(name => passes[stage][name]);
         }
       }
 
       return converted;
     }
 
-    options = objects.clone(options);
-
     let plugins = "plugins" in options ? options.plugins : [],
         config  = {
           parser: peg.parser,