Implemented the new generalized numeric classes for JSNumber.

Main gain are 'div', 'mod', 'floor', 'ceiling' and 'round'.
Updated package description.
Added another example: Analog Clock

Animates an analog clock in a canvas element of the browser.
The produced JS is completely off-shored to the browser. Once
the page is loaded the server can be shut off and the clock will
keep going.