organized js assets

completes #11

app/views/layouts/admin.html.erb

@@ -45,6 +45,8 @@
 
     <!--[if ! lte IE 8]><!-->
       <%= javascript_include_tag 'application', 'data-turbolinks-track': 'reload' %>
+      <%= javascript_include_tag 'admin', 'data-turbolinks-track': 'reload' %>
+      <%= yield :custom_javascipt %>
     <!--<![endif]-->
   </body>
 </html>

app/views/layouts/application.html.erb

@@ -52,6 +52,7 @@
 
     <!--[if ! lte IE 8]><!-->
       <%= javascript_include_tag 'application', 'data-turbolinks-track': 'reload' %>
+      <%= yield :custom_javascipt %>
     <!--<![endif]-->
 
   </body>