Add support for 'request' auth param

Author: dmitrizagidulin

default-views/auth/auth-hidden-fields.hbs

@@ -5,3 +5,4 @@
 <input type="hidden" name="redirect_uri" id="redirect_uri" value="{{redirect_uri}}" />
 <input type="hidden" name="state" id="state" value="{{state}}" />
 <input type="hidden" name="nonce" id="nonce" value="{{nonce}}" />
+<input type="hidden" name="request" id="request" value="{{request}}" />

lib/requests/auth-request.js

@@ -10,7 +10,7 @@ const debug = require('./../debug').authentication
  * @type {Array<string>}
  */
 const AUTH_QUERY_PARAMS = ['response_type', 'display', 'scope',
-  'client_id', 'redirect_uri', 'state', 'nonce']
+  'client_id', 'redirect_uri', 'state', 'nonce', 'request']
 
 /**
  * Base authentication request (used for login and password reset workflows).