title: ActiveAdmin renders datatype text as textarea in its forms
body: <p>My model consists of a couple rows with datatype <code>text</code>. Unfortunately <a href="http://activeadmin.info/" rel="nofollow">ActiveAdmin</a> seem to render these as a <code>&lt;textarea&gt;</code>. I would like to have them as an <code>&lt;input type="text"&gt;</code> but I cannot make it to work. My attempt so far:</p>
  
  <pre><code>form do |f|
    inputs do
      f.input :name, as: :text
      f.input :name, input_html: { type: "text" }
    end 
  end
  </code></pre>
  
  <p>Any idea how I can render datatype <code>text</code> row as a standard input, not as a textarea in ActiveAdmin?</p>
  
  <p>Thanks</p>