FreeSWITCH-FS-6798

Merge pull request #108 in FS/freeswitch from ~NNEUL/freeswitch:feature-dialplan-tstamps to master

* commit 'f175c7118879b882343da9b6f15075161923fcca':
  FS-6805 add support for logging full timestamps with dialplan, defaults to old behavior unless requested