ni_nitdoc: rethinked mmodule page.

Module page now displays intro classes, redef classes and refined classes (in this order)
Added a side bar block to quick list classes (sorted by kind)
Nested modules are always dislayed
Modified comment display for better readability

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>
ni_nitdoc: improved copy signature to clipboard with ZeroClipboard library

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>