Rsync over SSH improvements

[Joshua Parker Ruehlig]

Two improvements I propose..
*add documentation for rsync over ssh, specifically that you must 'remoteuser@remoteip' in the 'Remote Host' box. I found this out through trial and error.
*add a 'SSH Private Key' entry for users, 'SSH Public Key' is already there =] (

In order to get rsync pulling over ssh working I needed to add my private ssh key (id_rsa) to my freenas user I was running rsync as
I also needed to add a public key(id_rsa.pub), this is a bug, freenas doesn't need this, but the gui wouldn't accept this user unless I had one

I obviously also added my public key (authorized_keys) to my remote host's user's .ssh directory

Thanks for everything!

[admin]

The documentation was waiting for some fixes to be implemented. Now that beta3 is out, I'll take another crack at it.