[Tagging] Animal_shelter and animal_boarding

[Alberto]

Because some of you requested a more generic tag than kennel or cattery, and
others pointed out that animal shelter and boarding kennels/catteries should
be distinct, I ask to everybody if a good compromise could be to have
amenity=animal_shelter and amenity=animal_boarding. 
Please leave your comments here:
http://wiki.openstreetmap.org/wiki/Talk:Animal_shelter  so we can see all of
them together.
Thank you
Alberto