title: Add a new folder to asset path in rails 4
body: <p>I want to create a new folder in <code>app/assets</code>, in this folder I have some file, each file have css folder and javascript folder, like the below given addresses:</p>
  
  <p><code>app/assets/plugins/bootstrap/css/bootstrap.min.css</code>
  <code>app/assets/plugins/bootstrap/js/bootstrap.min.js</code></p>
  
  <p>I use below code to define <code>css</code> file, but not true and rails cannot find and load <code>bootstrap.min.css</code>:</p>
  
  <pre><code>&lt;%= stylesheet_link_tag "bootstrap.min", media: "all", "data-turbolinks-track" =&gt; true %&gt;
  
  &lt;%= stylesheet_link_tag "../plugins/bootstrap/css/bootstrap.min", media: "all", "data-turbolinks-track" =&gt; true %&gt;
  </code></pre>
  
  <p>How can I declare <code>css</code> and <code>javascript</code> from <code>plugin</code> folder?</p>
  
  <p>Note:
  When I want see the <code>css</code> file in browser by this address:</p>
  
  <pre><code>http://localhost:3000/assets/plugins/bootstrap/css/bootstrap.min.css
  </code></pre>
  
  <p>I get below error:
  <code>No route matches [GET] "/assets/plugins/bootstrap/css/bootstrap.min.css"</code></p>
  
  <p>But for css file that exist in <code>assets/stylesheets/</code> I can see css file in browser by enter address like top. Why the diffrent beetwin <code>stylesheets</code> and <code>plugins</code> directory?</p>