Artimus has a way of sneaking up behind you and poking you with his pointy nose to get your attention. That is not unusual behavior for a Shetland Sheepdog. What is surprising is when he greets you in a hotel lobby.   Compass Hotel by Margaritaville on Anna Maria Sound in Bradenton isn’t your typical Florida hotel. It is part of a new brand of hotels associated with popular singer-songwriter Jimmy Buffet.   Parrot Heads, as Buffet fans are affectionately known, will recognize its pet-friendly...