Added lightweight generics annotations to collection-typed method and protocol signatures to streamline usage of these members in Swift. Lightweight generic type specifiers are wrapped in conditionally-compiled macros for compatibility with Xcode 6.x.
Manually preprocess the NS_*_OF() macros in a temporary copy of each header before appledoc sees the headers. Also removed the --ignore flag because we no longer have a private headers folder under include/mbgl/ios/.