Merge in branch which gives you the ability to set the hangup causecode using...

Merge in branch which gives you the ability to set the hangup causecode using the Hangup application. (issue #7160 reported by kmilitzer branch by jcollie)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@30390 65c4cc65-6c06-0410-ace0-fbb531ad65f3