suppress the waring: "Warning: Permanently added '[localhost]:2022' (RSA) to the list of known hosts."
Merge pull request #200 from aheissenberger/fix/pull/ssh-remove-warning

ssh suppress the waring Permanently added
Merge pull request #201 from riobard/go

Bugfixes and improved comments
Simplified switch statement

Feeling stupid now...
Adjusted code style to be idiomatic Go

Kudos to @bradfitz!
Correctly report errors from os.Stat()