<p>This PR refactors user blocks and redactions to use CanCanCan.</p>
<p>This does change the response slightly for forbidden actions, rather than redirecting to :index with a flash message. But I'm happy with the simplification and I doubt anyone will notice the difference.</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/2051'>https://github.com/openstreetmap/openstreetmap-website/pull/2051</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>Migrate UserBlocksController to use CanCanCan</li>
  <li>Use CanCanCan for redaction authorizations</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2051/files#diff-0">app/abilities/ability.rb</a>
    (4)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2051/files#diff-1">app/controllers/redactions_controller.rb</a>
    (5)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2051/files#diff-2">app/controllers/user_blocks_controller.rb</a>
    (5)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2051/files#diff-3">test/controllers/redactions_controller_test.rb</a>
    (6)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2051/files#diff-4">test/controllers/user_blocks_controller_test.rb</a>
    (9)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/2051.patch'>https://github.com/openstreetmap/openstreetmap-website/pull/2051.patch</a></li>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/2051.diff'>https://github.com/openstreetmap/openstreetmap-website/pull/2051.diff</a></li>
</ul>

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