title: Rake aborted! Invalid CSS after " filter: progid": expected ";", was ":DXImageTransfo..."
body: <p>When I do <code>git push heroku master</code> I get......</p>
  
  <pre><code>mkdir -p /tmp/build_klvg6evbve3x/public/assets
  mkdir -p /tmp/build_klvg6evbve3x/public/assets
  (in /tmp/build_klvg6evbve3x)
  mkdir -p /tmp/build_klvg6evbve3x/public/assets
  mkdir -p /tmp/build_klvg6evbve3x/public/assets
  mkdir -p /tmp/build_klvg6evbve3x/public/assets
  mkdir -p /tmp/build_klvg6evbve3x/public/assets
  mkdir -p /tmp/build_klvg6evbve3x/public/assets
  mkdir -p /tmp/build_klvg6evbve3x/public/assets
  rake aborted!
  Invalid CSS after "  filter: progid": expected ";", was ":DXImageTransfo..."
  (in /tmp/build_klvg6evbve3x/app/assets/stylesheets/application.css)
  .............
  Precompiling assets failed, enabling runtime asset compilation
  Injecting rails31_enable_runtime_asset_compilation
  Please see this article for troubleshooting help:
  http://devcenter.heroku.com/articles/rails31_heroku_cedar#troubleshooting
  -----&gt; Rails plugin injection
  Injecting rails_log_stdout
  Injecting rails3_serve_static_assets
  -----&gt; Discovering process types
  Procfile declares types      -&gt; web
  Default types for Ruby/Rails -&gt; console, rake, worker
  -----&gt; Compiled slug size is 39.4MB
  -----&gt; Launching...
  !Heroku push rejected due to an unrecognized error.
  !We've been notified, see http://support.heroku.com if the problem persists.
  </code></pre>
  
  <p>then to....</p>
  
  <pre><code>To git@heroku.com:testapp.git
   ! [remote rejected] master -&gt; master (pre-receive hook declined)
  error: failed to push some refs to 'git@heroku.com:testapp.git'
  </code></pre>
  
  <p>I Don't have anything in my application.css that is <code>":DXImageTransfo..."</code> so I'm not sure whats happening.</p>
  
  <p>Now this is an issue because using Twitter Bootstrap and Simple_form, my forms are messed up and I think this is the reason why. Anyway to fix this? What's going on here?</p>