fix function name typo in Capfile template
ssh_options

allow user set ssh_options per server
user can provide global ssh settings

for example in deploy.rb:

      {
         keys: %w(/home/user/.ssh/id_rsa),
         forward_agent: false,
         auth_methods: %w(publickey password)
      }
show ssh options in template
Rename and add task hooks with descriptive names.
add task to archive and cleanup rolled-back release
Merge pull request #560 from teohm/v3-rename_hooks_with_rollback

Add :cleanup_rollback task
Merge pull request #550 from teohm/v3-template_typo

Fix function name typo in Capfile template
Merge pull request #557 from korin/ssh-options

Allow SSHKit::Backend.ssh_options to be set.
Preparing Release 3.0.0.pre13