v2.11.0

• added optional support for draft02 of Front-Channel Logout 1.0
  • enable with configuration features.frontchannelLogout = true;
  • adds new client properties frontchannel_logout_uri and frontchannel_logout_session_required
  • adds new discovery properties frontchannel_logout_supported and frontchannel_logout_session_supported
  • added frontchannelLogoutPendingSource helper for customizing the pending frontchannel web page HTML source
• added no-cache headers to userinfo responses