Provide better catalog breadcrumbs

+++ b/commerce_demo.module
@@ -61,3 +61,18 @@ function commerce_demo_modules_installed($modules) {
+  // Special check if Bootstrap is enabled and disable the breadcrumb_title
+  // for catalog pages.

We should expand this comment. Need to explain that when on a page with facets, the current page title is already rendered and the setting causes it to display twice

Committing with improved comment:

  // The Bootstrap theme provides a feature that appends the current page title
  // to the end of the breadcrumbs. On the catalog page this is awkward, as
  // Facets already appends the facet source page title when a facet filter
  // is active.
  //
  // This temporarily disables that setting, as module preprocess hooks will run
  // before the theme's, without actually changing the theme setting.