Use author date to be consistent with other tools (fixes #919)

James Moger

2015-09-18 a592329a82d0a85d33abcc63f08df20b79e8e4f7

 src/main/java/com/gitblit/manager/GitblitManager.java

@@ -662,6 +662,11 @@
   }

   @Override
   public UserModel authenticate(String username) {
      return authenticationManager.authenticate(username);
   }

   @Override
   public UserModel authenticate(HttpServletRequest httpRequest, boolean requiresCertificate) {
      UserModel user = authenticationManager.authenticate(httpRequest, requiresCertificate);
      if (user == null) {