recommended Xcode 4.6 project setting changes
Cache an image of maps for performance on Map VCs with sublabs
Add note about filter bar weirdness on labs list VC
Fix block retain cycles in 3 places

per http://jeremywsherman.com/blog/2013/02/27/leak-free-recursive-blocks/
and http://stackoverflow.com/a/10921206/734716

Isn't ARC fun???
Cache and reuse map images