Add user source property to schema

src/userdb.js

@@ -25,7 +25,7 @@ var assert = require('assert'),
     mysql = require('mysql');
 
 var USERS_FIELDS = [ 'id', 'username', 'email', 'fallbackEmail', 'password', 'salt', 'createdAt', 'modifiedAt', 'resetToken', 'displayName',
-    'twoFactorAuthenticationEnabled', 'twoFactorAuthenticationSecret', 'admin', 'active' ].join(',');
+    'twoFactorAuthenticationEnabled', 'twoFactorAuthenticationSecret', 'admin', 'active', 'source' ].join(',');
 
 function postProcess(result) {
     assert.strictEqual(typeof result, 'object');