title: formtastic and bootstrap compatibility
body: <p>are all the formtastic input types supposed to work when using the gem 'formtastic-bootstrap' ?</p>
  
  <p>in my case :</p>
  
  <pre><code> :as =&gt; :select
  </code></pre>
  
  <p>is working fine</p>
  
  <p>but</p>
  
  <pre><code>:as =&gt; :date_select   
  </code></pre>
  
  <p>gives Formtastic::UnknownInputError</p>
  
  <p>and </p>
  
  <pre><code>:as =&gt; :radio
  </code></pre>
  
  <p>is displaying indeed radio button but mixed with black dots (such as in a webpage with no css )  !?</p>
  
  <p>my gemfile contains :</p>
  
  <pre><code>gem 'formtastic', " ~&gt; 2.1.1"
  gem 'formtastic-bootstrap'
  gem 'twitter-bootstrap-rails'
  </code></pre>
  
  <p>my layouts/application.html.erb</p>
  
  <pre><code> &lt;%= stylesheet_link_tag    "application", :media =&gt; "all" %&gt;
  </code></pre>