Make carnivores able to eat raw meat

...without having to worry about all kinds of parasites.

This idea was proposed somewhere here on github or on the forums, and I think it is a good one. 
Carnivores should be able to eat raw meat, which no one is ever going to do if you risk a parasite infection while doing so. Because reducing the odds still won't convince people to eat raw meat, there is no other way than removing it alltogether for carnivores.

Eating raw fat, bones etc. should still give carnivores parasites, though. (This is open for discussion.)

The description of the mutation is also updated.

EDIT: whoops, accidentally made the changes on my master branch >.<