title: AngularJs, filter case insensitive
body: <p>I've got an json full of datas with lowcase and upcase.
  For example :</p>
  
  <pre><code>[
  
    { "firstName":"JoHn" , "lastName":"DoE" }, 
    { "firstName":"aNnA" , "lastName":"smIth" }, 
    { "firstName":"PeTer" , "lastName":"JOnes" }
  
  ]
  </code></pre>
  
  <p>And I've got something similar to this :</p>
  
  <pre><code>Search: &lt;input ng-model="searchText"&gt;
          &lt;table id="searchTextResults"&gt;
            &lt;tr&gt;&lt;th&gt;Name&lt;/th&gt;&lt;th&gt;Phone&lt;/th&gt;&lt;/tr&gt;
            &lt;tr ng-repeat="friend in friends | filter:searchText"&gt;
              &lt;td&gt;{{friend.firstName}}&lt;/td&gt;
              &lt;td&gt;{{friend.lastName}}&lt;/td&gt;
            &lt;/tr&gt;
          &lt;/table&gt;
  </code></pre>
  
  <p>What I want to do is to search a friend without looking at upcases and lowcases.
  So basically when I type "John", "JOHN" or simply "john" in my input, it should return my friend John.</p>
  
  <p>So is it possible to apply a case insensitive option to a filter ?</p>