Do something until a feature is enabled

[cjsaylor]

When we want to do something until a feature is enabled, we have to do something like:

$swivel
  ->forFeatutre('Shiny')
  ->addBehavior('new', function() {})
  ->defaultBehavior(function() {
    // Do normal stuff until Shiny.new is enabled
  })
  ->execute();

Proposal, add a new manager type that executes all behaviors until the feature is enabled:

$swivel
  ->untilFeature('Shiny')
  ->addBehavior('new', function() {
    // Do normal stuff until Shiny.new is enabled
  })
  ->execute();

Invoke form would be:

$swivel->invokeUntil('Shiny.new', function() {
  // Do normal stuff until Shiny.new is enabled
});