#44 use hover over node to show class name

[Raphael Ackermann]

using the hover gef facilities it would be possible to
show the class name of a node if hovered above.

it is somehow useless at the moment, as I am only
showing the method names.

or could maybe show class name all the time

e.g.,

classname
methodname

and add package name when hovering. hm hm
can always click and open source I guess