added -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no  to ssh and scp commands to ignore host key checks
Added option ignoreHostKey and ignoreKnownHosts
Added spaces around sshOptions string
changed ssh options to use options.sshOptions object
Fixed README formatting of sshOptions
added tests for sshOptions
Merge pull request #7 from mbrevoort/pr/host_key

Ignore host key checks