Bump version to 0.7.2-dev
Add error for ssh connection issues.
Add automatic keepalive to SSH sessions.
Update password prompts to disable local echo.
Update adding guaranteed preferences for Net::SSH

The user known hosts file is now set to /dev/null and strict host key
checking is disabled for Net::SSH.  This mirrors the SSH options used
for ssh and rsync on remote hosts.
Merge branch 'working'
Bump version to 0.7.2