feat(docs): css customizations for buttons

update css samples to support css rule changes for default themes
add docs configuration to include Component CSS Customization content.

Author: ThomasBurleson

docs/app/js/app.js

@@ -169,38 +169,48 @@ function(SERVICES, COMPONENTS, DEMOS, PAGES, $location, $rootScope, $http, $wind
   sections.push({
     name: 'Customization',
     type: 'heading',
-    children: [{
-      name: 'CSS',
-      type: 'toggle',
-      pages: [{
-        name: 'Typography',
-        url: '/CSS/typography',
-        type: 'link'
-      }]
-    },{
-      name: 'Theming',
-      type: 'toggle',
-      pages: [{
-        name: 'Introduction and Terms',
-        url: '/Theming/01_introduction',
-        type: 'link'
-      },
-      {
-        name: 'Declarative Syntax',
-        url: '/Theming/02_declarative_syntax',
-        type: 'link'
-      },
+    children: [
       {
-        name: 'Configuring a Theme',
-        url: '/Theming/03_configuring_a_theme',
-        type: 'link'
+        name: 'CSS',
+        type: 'toggle',
+        pages: [{
+            name: 'Typography',
+            url: '/CSS/typography',
+            type: 'link'
+          },
+          {
+            name : 'Button',
+            url: '/CSS/button',
+            type: 'link'
+          }]
       },
       {
-        name: 'Multiple Themes',
-        url: '/Theming/04_multiple_themes',
-        type: 'link'
-      }]
-    }]
+        name: 'Theming',
+        type: 'toggle',
+        pages: [
+          {
+            name: 'Introduction and Terms',
+            url: '/Theming/01_introduction',
+            type: 'link'
+          },
+          {
+            name: 'Declarative Syntax',
+            url: '/Theming/02_declarative_syntax',
+            type: 'link'
+          },
+          {
+            name: 'Configuring a Theme',
+            url: '/Theming/03_configuring_a_theme',
+            type: 'link'
+          },
+          {
+            name: 'Multiple Themes',
+            url: '/Theming/04_multiple_themes',
+            type: 'link'
+          }
+        ]
+      }
+    ]
   });
 
   var docsByModule = {};