* nua_stack.c: include Allow-Events in most messages initiating dialog
  
  The Allow-Events header is now included with NOTIFY, PUBLISH, REGISTER, and
  initial INVITE, SUBSCRIBE, REFER, and OPTIONS, and also responses to
  SUBSCRIBE, REFER, OPTIONS, and PUBLISH as well as responses to initial
  INVITE and NOTIFY.
  
  Thanks to Jerry Richards for pointing out the problem.



git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@8017 d0543943-73ff-0310-b7d9-9358b9ac24b2