title: deploying to heroku error "! [remote rejected] master -> master (pre-receive hook declined)"
body: <p>git push heroku master was rejected.  i did some digging in the log and here is what i found.  i have never seen this before.</p>
  
  <p>this was the first thing in the log that looked like it did not go well.  everything before was successful.</p>
  
  <pre><code>rake aborted!
     Invalid CSS after "*/": expected identifier, was "/*!"
     (in /tmp/build_2a4aaujom538/app/assets/stylesheets/application.css)
  </code></pre>
  
  <p>at the very end, the push stops and here is the reason</p>
  
  <pre><code>Precompiling assets failed.
  Push rejected, failed to compile Ruby/Rails app
  [remote rejected] master -&gt; master (pre-receive hook declined)
  error: failed to push some refs to 'git@heroku.com:triprecs.git'
  </code></pre>
  
  <p>any ideas on what to check/fix?  thanks</p>