Fixed scp fails in case the ssh login is with key instead of user and pass
Fixed ssh-deploy task hangs on finish #3
Async series should callback when done #3
Fixed hook commands are triggered even if empty or undefined.
Fixed hook after_deploy in fact triggers before_deploy command
Added feature to add an array of commands in the pre/post deploy hooks
Fixed rollback hangs too
Added possibility to have default options for all environments
Small fix
Merge pull request #7 from alexandrusavin/master

scp fails in case the ssh login is with key (plus other minor bug fixes)