Small update to NetworkManager homepage

[Philipp Weissenbacher <philipp weissenbacher gmail com>]

Hello NM developers,

I just found me stumbling through the NetworkManager homepage's developers page [http://projects.gnome.org/NetworkManager/developers/] and I didn't find a link to the NM's wiki page [http://live.gnome.org/NetworkManager].

As it seems that he latter is kept more up to date, so please put a link on the developer's site.

As I'm at it please also link to NM's homepage from freedesktop.org's wiki page [http://www.freedesktop.org/wiki/NetworkManager].

Regards,

Philipp