title: Can't find big file that's preventig git push
body: <p>So I made a little error and at some point committed a big file called <code>.RData</code> that is 108 mb in size.
  I, kind of panically, then did a <code>git rm --cached .RData</code>.
  However, I still cannot push the commits to my remote.
  After the <code>git push</code>, I always get this message:</p>
  <pre><code>remote: error: Trace: 7c9c0060d88b48827d9e9904b1934066d6c1246b93268a4344e430c0603181fe
  remote: error: See http://git.io/iEPt8g for more information.
  remote: error: File .RData is 108.33 MB; this exceeds GitHub's file size limit of 100.00 MB
  </code></pre>
  <p>However, I don't know where to look for this <code>.RData</code>-file. Its certainly not in the directory and when I do a <code>git rm --cached</code>, I get:</p>
  <pre><code>fatal: pathspec '.RData' did not match any files
  </code></pre>
  <p>Maybe someone has an idea how I could get rid of this file.</p>