Don't set the style of all the <ul> and <li> in the css, use the class
* added the Control * added the frontend-code * added the control to the examples "gui-newAPI.ino" and "tabbedGui.ino"
* new member of Control: parentControl * changed addControl() to add children of elements * added some styles in the css * two new divs in index.html * added frontend code to controls.js * added new demo to demonstrate the tabbed view
