title: Django filter() lookup type documentation
body: <p>I looked on Django's documentation and Googled every varation of the phrase but I cannot find any documentation that exactly describes the behaviour of lookuptypes.</p>
  
  <pre><code>app.objects.filter(column__lookuptype=criteria)
  </code></pre>
  
  <p>I have found documentation on which lookuptypes I <em>can</em> use but not what they do or how to use them.  For example, I have no bloody clue what <code>__gte</code> does, but I cannot find good documentation on what it does either.</p>
  
  <p>Is there documentation that I overlooked?</p>
  
  <p>Any pointers in the right direction would be greatly appreciated. Thanks!</p>