package/canfestival: new package

package/canfestival: new package

Note: the patch adding the pkgconfig module has been sent upstream [1].

[1] http://sourceforge.net/p/canfestival/mailman/message/32876320/

[Thomas:
 - license seems to be only LGPLv2.1+. At least, the specific files
   pointed to be GPLv2 carry a LGPLv2.1+ header.
 - added thread dependency
 - minor rewording here and there.]

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Cc: Eric Jarrige <eric.jarrige@armadeus.org>
Cc: Julien Boibessot <julien.boibessot@armadeus.com>
Cc: Davide Viti <zinosat@tiscali.it>
Cc: Claudio Laurita <claudio.laurita@integrazionetotale.it>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>