Fix labeling on curriculum index page; fix labeling on homepage curriculum selector; add a "button-group" class to the extendables sass file; add a "View module overview" button to grade level page module listed items;
Add curriculum type to breadcrumb;
Add curriculum facets to curriculum search;
Add promos back to homepage
Put css for homepage promos back in to homepage partial; Spell out the full names of curricula in the homepage switcher; Update css of switcher to shrink padding a bit; Change references to "Social Science" to "Social Studies" globally; Only show one grade selectable for Social Studies curricula; Add curricula to text detail page title to match change to grade pages; Add module overview/download button group to module entries on grade level page;
Merge branch 'master' into gh-pages