Change AES_GCM to aes-128-gcm

I am using an browserify version of node's crypto aes encryption, this is the only valid GCM cipher mode.

Author: gbhrdt

nodejs/ece.js

@@ -5,7 +5,7 @@ var base64 = require('urlsafe-base64');
 
 var savedKeys = {};
 var keyLabels = {};
-var AES_GCM = 'id-aes128-GCM';
+var AES_GCM = 'aes-128-gcm';
 var PAD_SIZE = 2;
 var TAG_LENGTH = 16;
 var KEY_LENGTH = 16;