chore(doc-gen): improve grouping and sorting of api nav items

Author: petebacondarwin

docs/config/processors/pages-data.js

@@ -56,8 +56,19 @@ var navGroupMappers = {
             delete docTypes.module;
           })
 
+          .tap(function(docTypes) {
+            if ( docTypes.input ) {
+              docTypes.directive = docTypes.directive || [];
+              // Combine input docTypes into directive docTypes
+              docTypes.directive = docTypes.directive.concat(docTypes.input);
+              delete docTypes.input;
+            }
+          })
+
           .forEach(function(sectionPages, sectionName) {
 
+            sectionPages = _.sortBy(sectionPages, 'name');
+
             if ( sectionPages.length > 0 ) {
               // Push a navItem for this section
               navItems.push({