Selenium Java Robot layer

This commit contains a new implementation of the `aria.jsunit.IRobot` interface to use the Selenium Java Robot.

The Selenium Java Robot tool is available here: https://github.com/ariatemplates/selenium-java-robot

If the browser was launched with the Selenium Java Robot tool, it will be detected automatically by the `aria.jsunit.Robot` class and the corresponding implementation of the interface will be used.

Well, I would prefer having a common base class rather than extending `RobotJavaApplet`.
I will update the code...