feat #1237 clickbuster implementation

a new touch event has been created (safetap) in order to handle the tap gesture without any side effects due to the ghost click, generated by the browsers in mobile devices.
If a mousedown, click or touchend event is detected after a safetap on the same area, it is ignored since considered as a ghost click: preventDefault() and stopPropagation() are called.
In this way, if the DOM changes after the safetap event is handled, the browser's ghost click will not have effects.

reference:
http://ariatemplates.com/blog/2014/05/ghost-clicks-in-mobile-browsers/

close #1237
feat #1280: 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.

close #1280