Merge pull request #18 from l1ll1/master

pull request to take to most recent cvlsshutils
updates to auth regarding aaf
Merge branch 'master' of github.com:l1ll1/cvl-ssh-utils
AAF_Auth on Mac OS was a bit broken
Merge pull request #3 from l1ll1/master

A bunch of changes on cvl-ssh-utils to support aaf authentication