title: Parse JSON string to Dictionary<String, Integer> with Gson
body: <p>I have a JSON string which looks as following: <code>{"altruism":1,"amazon":6}</code></p>
  
  <p>What I want to have is a <code>HashMap&lt;String, Integer&gt;</code> with two entries afterwards.</p>
  
  <pre><code>Key: altruism Value: 1
  Key: amazon Value:6
  </code></pre>
  
  <p>I really can't figure out how to do this. Normally there are objects parsed from JSON strings, but that's not the case here.</p>