Use precise distro for Travis builds to allow PHP 5.3 to work
Use precise distro for Travis builds to allow PHP 5.3 to work

silverstripe-australia/silverstripe-gridfieldextensions,kinglozzer/silverstripe-gridfieldextensions,dhensby/silverstripe-gridfieldextensions,dhensby/silverstripe-gridfieldextensions,silverstripe-australia/silverstripe-gridfieldextensions,symbiote/silverstripe-gridfieldextensions,symbiote/silverstripe-gridfieldextensions,kinglozzer/silverstripe-gridfieldextensions