Addition of the bandwidthd-pgsql package variant that can save also
in a postgres database.

Modification of bandwidthd.config to have the default IP address
of an OpenWrt router (192.168.1.1)

Addition of a small OpenWrt logo in the logo.gif

Compile tested on CC and trunk (ar71xx and mvebu in both cases)
run tested on CC (ar71xx) and trunk (r47397 on mvebu)

Signed-off-by: Jean-Michel Lacroix <lacroix@lepine-lacroix.info>