title: open an activity from a CordovaPlugin
body: <p>I have written a CordavaPlugin derived class.</p>
  
  <pre><code>public class ShowMap extends CordovaPlugin {
  
  @Override
  public boolean execute(String action, JSONArray args,
          CallbackContext callbackContext) throws JSONException {
  
      if (action.compareTo("showMap") == 0)
      {
          String message = args.getString(0); 
          this.echo(message, callbackContext);
  
          Intent i = new Intent();
  
  
          return true;
      }
  
      return false;
  }
  
  private void echo(String message, CallbackContext callbackContext) {
      if (message != null &amp;&amp; message.length() &gt; 0) { 
          callbackContext.success(message);
      } else {
          callbackContext.error("Expected one non-empty string argument.");
      }
  }
  
  }
  </code></pre>
  
  <p>I want from this class to open a new activity.
  How do I get access to the original context of the phonegap based class?</p>