<p>This PR adds one of my favourite gems - <a href="https://github.com/charliesome/better_errors">better_errors</a></p>
<p>In particular, I like the REPL that allows you to interact with the current state of the app. I often use it when debugging controllers, figuring out what's going wrong with params and form submissions and the like.</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/openstreetmap/openstreetmap-website/pull/1815'>https://github.com/openstreetmap/openstreetmap-website/pull/1815</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>Add better_errors gem for easier debugging</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/1815/files#diff-0">Gemfile</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/1815/files#diff-1">Gemfile.lock</a>
    (10)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/1815.patch'>https://github.com/openstreetmap/openstreetmap-website/pull/1815.patch</a></li>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/1815.diff'>https://github.com/openstreetmap/openstreetmap-website/pull/1815.diff</a></li>
</ul>

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