title: Rails 3.1 asset precompilation - include all javascript files
body: <p>I want Rails 3.1 to pick up more of my assets for precompilation. In particular, the default matcher for compiling files doesn't add <code>.js</code> files from <code>vendor/assets/javascripts</code>. I can just add the assets to the <code>config.assets.precompile</code> list, but this seems annoying. I don't want to refer to them in the <code>application.js</code> manifest, because I don't want them included in all pages.</p>
  
  <p>In summary, any way to request that all <code>.js</code> files found in <code>vendor/assets/javascripts</code> get precompiled by <code>rake assets:precompile</code>, but without having them included in all pages?</p>