Including changes:
1 - Updated readme for more info and gotcha
2 - Created ActiveSalesHelper for one place access to live and active events, which prevents multiple db calls and load sales from a cached query
3 - UI Changes are similar to taxonomy and taxon, which gives the ability to have child parent relation in sales and events
4 - Parent - Child relation gives: flexibility to have sale events under an event, like: 'Men' -> 'Apparel' -> 'Jeans' -> 'Brand name of some jeans'
5 - Updated engine to load environment before for configuration
Merge branch '1-3-stable' of github.com:suryart/spree_active_sale into 1-3-stable