autozoom.lua with support of automatic update of views.

This module was discussed previously in the mailing list. It provides per-domain zoom properties stored in database.
I've implemented next features:
Optional status in the window's statusbar with customizable text.
Changing of zoom property of current view will be immediately applied to any view in any window if it's uri has the same domain as the uri of the current view.
Options can be changed in rc.lua (autozoom.level=1.2 for example).

This module does not change (thus does not break) any keybindings itself.