Add a footnote to the nil-namespaced @selector case that suggests preferring a forward declaration of the otherwise-invisible namespace to preserve the functionality of -Wunknown-selector and ARC.
Emphasize that the method resolution algorithm only applies at runtime.
Add a preliminary example of implementing public/private/package/protected methods using namespaces. The gist is that each class has three associated, unspellable (?) namespaces. These namespaces are implicitly in or out of scope based on the enclosing @implementation block.
Merge branch 'master' into updates

Incorporate addition of llvm subtrees and the script to help set them up.
Merge branch 'master' into updates
Start separating rationales from normative text.
Allow Objective-C namespaces to be nested within C++ namespace blocks.