Updated promotion logic to perform Notifier actions

Updated the promotion logic to fail the build upon an action failure,
but continue to run the actions in the promotion.  This is so other
actions will run after the failure (i.e. be able to send emails out, or
report test failures).

It is up to the Action to determine if it should continue from the build
status (which is appears to be the case for most plugins, other than
maven).