[Tips & Tricks] Jungling with Nunu: A.P. Nunu vs. Support-tank Nunu!

So today I ventured into the Jungle with to try out the new and see the changes. The past few games I've played him in the jungle I built like a supportive-tank and did very well with early objective control but when I ventured out onto the rift today I wound up flamed ( which made me nervous for the rest of the match ) for not being an A.P. ganker. I was under the impression his A.P. wasn't very desirable but having had the experience I had today I figured I'd best come and ask for some insight regarding our friend and his yeti companion. What I want to know is...

• Is there a time where one should build him as an A.P. fighter/caster/whatever he'd be instead of building him as a supportive-tank?
• What are the signs I should be building A.P. instead of as a tank?
• How does my clear path differ if I build A.P. instead of supportive-tank?
• How would I go about ganking ( I imagine this question ties into the last one ) given I wouldn't be focusing early objectives such as Dragon/Rift Harold?
• Is his A.P. build really a viable option?
• What else should I know about jungling with him and his yeti?
• A little off topic but what team comps should I pick him into? So far I've been picking him into teams with multiple auto-attack champs.

I'm hoping the community is able to help me out! I'd hate to see them both die and I'm pretty sure the thought would sadden them too! [zombie-nunu-tears]