title: Need a new method in CatalogEndpoint: findAllProductsForCategory
body: <p>I have REST API working, but I need a way to return all products within a certain category.  Right now I'm using <strong>findSearchResultsByCategoryAndQuery</strong> by passing the category id and using a <em>very</em> generic query to get almost all the products in the category.  What I really need is a method called findAllProductsForCategory which returns all products in the category.</p>
  
  <p>I'm new to Broadleaf and REST API, can someone please guide me through how to extend CatalogEndpoint to get the functionality I need.</p>