Add files missed in last commit

src/type/keyid.js

@@ -28,7 +28,7 @@
 
 module.exports = Keyid;
 
-var util = require('../util');
+var util = require('../util.js');
 
 /**
  * @constructor

src/type/mpi.js

@@ -37,7 +37,7 @@
 module.exports = MPI;
 
 var BigInteger = require('../crypto/public_key/jsbn.js'),
-  util = require('../util');
+  util = require('../util.js');
 
 /**
  * @constructor

src/type/s2k.js

@@ -32,7 +32,7 @@
 module.exports = S2K;
 
 var enums = require('../enums.js'),
-  util = require('../util'),
+  util = require('../util.js'),
   crypto = require('../crypto');
 
 /**