[MAP] Adds pugs and makes it easier to add new dog breeds.

Pugs were added.

Dogs are easier to add.

Corgis and pugs were moved to a new dogs folder.
Dog.dm was added for things that all dogs have in common.

sprites: http://i.imgur.com/XILwKe1.png

Idea thread:http://www.ss13.eu/phpbb/viewtopic.php?f=5&t=1198&start=100

This was requested by theterbs then supported by a small group of loud individuals.