title: javascript asset not being found in gem
body: <p>This should have been a no-brainer, but has me stumped.</p>
  
  <p>For convenience, I took a bootstrap plugin (<a href="https://github.com/taleinat/bootstrap-combobox" rel="nofollow">bootstrap-combobox</a>) and turned it into a gem, so I can version it properly and all.</p>
  
  <p>My gem is <a href="https://github.com/constantorbit/bootstrap-combobox-rails" rel="nofollow">bootstrap-combobox-rails</a>.</p>
  
  <p>It packages up fine, bundle installs fine, but when I try to reference the assets: The stylesheet works, although I have to do it like this in my <code>application.css.scss</code>:</p>
  
  <pre><code>@import "bootstrap-combobox.css";
  </code></pre>
  
  <p>(everything else is fine without the .css).</p>
  
  <p>The javascript is not found, though.  No matter if I reference it as</p>
  
  <pre><code>//= require bootstrap-combobox.js
  </code></pre>
  
  <p>or</p>
  
  <pre><code>//= require bootstrap-combobox
  </code></pre>
  
  <p>I get:</p>
  
  <pre><code>$ rake assets:precompile
  /Users/denishaskin/.rvm/rubies/ruby-1.9.3-p374/bin/ruby /Users/denishaskin/.rvm/gems/ruby-1.9.3-p374@oneclick/bin/rake assets:precompile:all RAILS_ENV=production RAILS_GROUPS=assets
  rake aborted!
  couldn't find file 'bootstrap-combobox.js'
    (in /Users/denishaskin/clients/cs/1-click/oneclick/app/assets/javascripts/application.js:18)
  </code></pre>
  
  <p>Suggestions?  Thanks...</p>