Update buffertools dependency

Buffertools 2.0.1 is required to build on VC2013.
With the change to v2.x, the buffertools.extend() method must be called
to mimic the prototype extention behavior of the 1.x versions.

Fix mcavage/node-ldapjs#163

lib/messages/parser.js

@@ -34,7 +34,7 @@ var Message = require('./message');
 var Protocol = require('../protocol');
 
 // Just make sure this adds to the prototype
-require('buffertools');
+require('buffertools').extend();
 
 
 

package.json

@@ -29,7 +29,7 @@
   "dependencies": {
     "asn1": "0.1.11",
     "assert-plus": "0.1.2",
-    "buffertools": "1.1.0",
+    "buffertools": "2.0.1",
     "bunyan": "0.21.1",
     "dtrace-provider": "0.2.8",
     "nopt": "2.1.1",