First completly working prototype
Now fully functional, but UI still needs to be polished. Improved the
isHandlerForURL()-method of the ZDFHandler (using regular expressions).
Loading animation while requesting and parsing page.
If the user isn't on a recognized page, the addon will tell him when ran.
If the user visits a recognized page, the icon and text of the widget will
change according to the mediathek that has been recognized.