Druids, the Furry Ones.

Druids are one of those classes that can fill all 3 rolls, Tank, Damage, and Healing.
Damage- Feral(Cat) or Balance
Tank- Feral(Bear)
Healing- Restoration...duh

Here is the Cat dps spec. Rotation is Mangle, Rake, Shred x 3, then Rip. A lot of you dmg is gonna be bleeds, and you're using Shred so stay at a position where its usable.

http://talent.mmo-champion.com/?druid=0000000000000000000000000000503202132322010053120031313511005503012000000000000000000&glyph=181710030106&version=9626

Moonkin, the caster dmg side of a Druid. While in Moonkin form, Insect Swarm, Moonfire, Starfire, Wrath is a decent rotation to use. Starfall can be used if needed.

http://talent.mmo-champion.com/?druid=5032103125331033213005311031000000000000000000000000000000205003312000000000000000000&glyph=202219050706&version=9626

Bear tanks are rather efficient, good dodge and high health, as well as being automatically defense capped without bonuses from gear, meaning you can put more into Stamina. Mangle whenever available, apply your 5 Lacerates, and Maul. You also have the nice "oh crap" buttons, Barkskin and Survival Instincts just in case. For Pulls with multiple enemies, I like spamming swipe.

http://talent.mmo-champion.com/?druid=0000000000000000000000000000503232130322010353120300013511005503012000000000000000000&glyph=031110020406&version=9626

Restoration Druids use the Tree of Life form and specialize in Heal over Time spells, and can make very effective healers for raid healing, but they can also do Main Tank healing.
This one is simple, use Rejuvenation, Regrowth, and Lifebloom as needed, lifebloom stacks as well. Wild Growth is great for healing multiple party members at once.

http://talent.mmo-champion.com/?druid=0532003100000000000000000000000000000000000000000000000000230503312031502531350013051&glyph=152116070406&version=9626

Have fun.