New release 1.3.1!

[Ondrej Filip]

Hi!
New version is ready! It includes mainly minor bugfixes and minor
improvements related to BGP and Linux port, all made by Santiago. We
are working on packaging and other stuff.

Changes:
Version 1.3.1 (2011-05-02)
  o Added Linux kernel route attributes krt_prefsrc and krt_realm.
  o Added BGP option 'med metric' related to MED handling.
  o Allows to use constants from /etc/iproute2/rt_* files.
  o Several bugfixes.

                        Ondrej