Always enable the new campaign button when closing the campaign editor.
Collapse creative editor  when opening campaign editor.
Support collections on promoted/inventory page.
Allow updated UI on pages other than promoted/edit_promo.
Make PromoteLinkEdit inherit from PromoteLinkBase.

Add methods for getting form data to PromoLinkBase.
Remove dependency on fill_campaign_editor from sponsored.js methods.
Allow setting default targeting type for targeting_field.
Make min/max constraints in timing_field optional.
Update sponsored/inventory with new UI.
Update sponsored/report page with new UI.
Update sponsored/roadblock page with new UI.
Make PromoteLinkNew subclass of PromoteLinkBase.

Not needed at this point, but for consistency.