mv - _call_hooks outside of class, general module method.
mod - option activates release tag rather than suppresses.
add - release tag when specified; add tagging to custom.
mod - ensure pre-sync custom hooks are called in DeployDriverCustom.
mod - drop 'hook_script' option and make a bool option for invoking default syncing.
mod - merge 'Custom' driver into default, handle invocation.
rm - obsolete imports.