Update copyright.
[core] Remove unecessary headers in NIDataStructures.m.
[core] Delete /// dividers in NIDeviceOrientation.m.
Delete /// dividers across all of Nimbus.
[core] Deprecate and clean up NINavigationAppearance.
Delete redundant readwrite property attributes.
Delete all synthesizers.
[core] Delete reference to NILinkedList in NIInMemoryCache.
[overview] Remove references to NILinkedList.
[photos] Update bound deprecations.
Remove NI_WEAK/NI_STRONG macros and update all references accordingly.
[core] Fix indentation in NIPaths.
[core] Stylistic cleanup of NIOperations.
Standardize pragma marks.
[core] Add missing core foundation version numbers for iOS 6 and 6.1.
[core] Remove iOS 4-specific logic in NIScreenScale.
[core] Remove pre-iOS 6 compat.
[core] Stylistic cleanup of NISnapshotRotation.
[core] Stylistic cleanup of NIState.
[core] Stylistic cleanup of NIViewRecycler.