Update Angular documentation (2.0.0rc4)

assets/stylesheets/pages/_angular.scss

@@ -19,7 +19,7 @@
   .alert.is-important { @extend %note-red; }
   .alert.is-helpful { @extend %note-blue; }
 
-  td > h3, .l-sub-section > h3, .l-sub-section > h4, .alert > h3, .alert > h4 {
+  td > h3, .l-sub-section > h3, .l-sub-section > h4, .alert > h3, .alert > h4, .row-margin > h3 {
     margin-top: .25rem;
     font-size: 1em;
   }

lib/docs/scrapers/angular.rb

@@ -42,7 +42,7 @@ module Docs
     end
 
     version '2.0 TypeScript' do
-      self.release = '2.0.0rc3'
+      self.release = '2.0.0rc4'
       self.base_url = "https://angular.io/docs/ts/latest/"
     end