title: Polymer 2 migration issues
body: <p>Recently tried to migrate a Polymer1 app to Polymer2 but I am really having a hard time to get stuff working. Here are some things I noticed when trying:</p>
  
  <ul>
  <li>Do I really have to hand pick every paper/iron element for polymer2? I used to just install paper-elements and the like, this was a convenient way to simply get all components in a category, is there a similar way to get all paper-elements for polymer 2?</li>
  <li>The Api for paper-toolbar specifies a justify property that would center the content, but this does not seem to work in the case below:</li>
  </ul>
  
  <p>```</p>
  
  <pre><code>&lt;paper-toolbar class="tall" justify="center" bottom-justify="center"&gt;
    &lt;div slot="top" class="title"&gt;Top Title&lt;/div&gt;
    &lt;div slot="middle" class="title"&gt;Middle Title&lt;/div&gt;
    &lt;div slot="bottom" class="title"&gt;Bottom Title&lt;/div&gt;
  &lt;/paper-toolbar&gt;
  </code></pre>
  
  <p>```</p>
  
  <ul>
  <li>The fullbleed class on the body does not work anymore. I've included the iron-layout-classes and iron-layout files, but these do not have any effect :(</li>
  </ul>
  
  <p>Am I missing something?</p>