Updating node.js version and documentation

Author: martinthomson

nodejs/ece.js

@@ -1,4 +1,24 @@
 'use strict';
+/*
+ * Encrypted content coding
+ *
+ * === Note about versions ===
+ *
+ * This code supports multiple versions of the draft:
+ *
+ * aes128gcm: The most recent version, the salt, record size and key identifier
+ *    are included in a header that is part of the encrypted content coding.  In
+ *    order to select this version, the |salt| parameter is omitted from calls
+ *    to encrypt() and decrypt().  A value for the salt is automatically
+ *    generated by this API when encrypting, which avoids errors.
+ *
+ * aesgcm: The version that is widely deployed with WebPush (as of 2016-10).
+ *    This version is selected by default if you provide a |salt| parameter and
+ *    either omit the |padSize| parameter, or set it to 2.
+ *
+ * aesgcm128: This version is old and will be removed in an upcoming release.
+ *     Select this version by providing |salt| and a |padSize| of 1.
+ */
 
 var crypto = require('crypto');
 var base64 = require('urlsafe-base64');

nodejs/package.json

@@ -1,6 +1,6 @@
 {
   "name": "http_ece",
-  "version": "0.5.2",
+  "version": "0.6.0",
   "description": "Encrypted Content-Encoding for HTTP",
   "homepage": "https://github.com/martinthomson/encrypted-content-encoding",
   "bugs": "https://github.com/martinthomson/encrypted-content-encoding/issues",