In preparation for using any 2FA solution, it will most likely need to modify sshd_config, so let's change the file in place instead of overwriting it completely.
Merge pull request #198 from jplock/jp-sshd-simplification

Modify sshd_config in place
Added Google Authenticator 2FA logins
Automatically generate the Google authenticator file for the default user
Clarified parameters are bit in a comment
Merge pull request #199 from jplock/jp-googleauth

Added Google Authenticator 2FA logins
Update README with 2-factor auth