title: kotlin startactivity with flags
body: <p>I am trying to start an acitvity through Anko context using kotlin, But would like to use flags</p>
  
  <pre><code> override fun createView(ui: AnkoContext&lt;MyActivity&gt;) = with (ui) {
          verticalLayout {
              // load something
              button ("Back") {
                  onClick {
                      // goes back to the previous activity
                      startActivity&lt;PreviousActivity&gt;()
                  }
              }
          }
      }
  </code></pre>
  
  <p>I am raising an activity like so, </p>
  
  <pre><code>startActivity&lt;PreviousActivity&gt;()
  </code></pre>
  
  <p>How can I add the flags to reorder the activity to top</p>
  
  <p>This did not work, get a type mismatch error</p>
  
  <pre><code>startActivity(intentFor&lt;PreviousActivity&gt;("id" to 5).singleTop())
  </code></pre>