fix minor typo (exect -> exec)
Fix "can't convert Net::SSH::AuthenticationFailed into String (TypeError)"

Another minor fix so veewee doesn't error out while trying to raise an error :D
Merge pull request #712 from egonSchiele/patch-1

fix minor typo (exect -> exec)
Merge pull request #714 from egonSchiele/patch-2

Fix "can't convert Net::SSH::AuthenticationFailed into String (TypeError...
Merge branch 'master' of git://github.com/jedi4ever/veewee