title: Serializing scala map with gson returns "key" with every key
body: <p>New to scala and tried searching for this but couldn't find a solution for it. I've a scala map like shown below:</p>
  
  <pre><code>val myMap = Map("foo" -&gt; "baz")
  </code></pre>
  
  <p>I want to serialize this using Gson library and here's what I am doing:</p>
  
  <pre><code>val json = new Gson()
  val serializedMap = json.ToJson(myMap)
  </code></pre>
  
  <p>When I print the <code>serializedMap</code> I get
  <code>"{"key1":"foo", "value1":"baz"}"</code> but I was expecting <code>"{"foo": "baz"}"</code></p>
  
  <p>What am I missing?</p>