Add AFNetworking

- Add AFNetworking as submodule
- Create Xcode subproject for AFNetworking (TODO this should be a repo of its own)
Clean up Copy Bundle Resources build phase
Add prefix header
Fix AFNetworking built product location for link phase
TODO UIKit+AFNetworking headers aren't in umbrella header

This causes 9 module warnings, as whatever's in those headers won't be accessible with @import.
TODO: Investigate SetCFBundleVersionString.sh's cause of failure

Set default bundle version to 0.0.0
Add CocoaLumberjack as submodule and subproject