Add tax_references, its controller and some basic pages for viewing ref data about taxes.

app/views/layouts/_top_navigation.html.erb

@@ -7,11 +7,11 @@
 
   <div class="collapse navbar-collapse" id="navbarSupportedContent">
     <ul class="navbar-nav mr-auto">
-      <li class="nav-item active">
-        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
+      <li class="nav-item">
+        <%= link_to(t('Home'), root_path, class: 'nav-link') %>
       </li>
       <li class="nav-item">
-        <a class="nav-link" href="#">Link</a>
+        <%= link_to(t('Tax References Tables'), tax_references_path, class: 'nav-link') %>
       </li>
       <li class="nav-item dropdown">
         <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">