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/.
Added some nullability qualifiers in method implementation selectors for consistency with declarations.
The user dot view now has a non-zero size. Previously only its layer was sized properly. Also resolved some pedantic warnings about missing designated initializer overrides.
Xcode 6.3 or above is now required for building this project.
`-pauseMetricsCollection` and `-resumeMetricsCollection` were originally introduced to mitigate concerns around battery usage, but `MGLMapboxEvents` has since evolved to tread much lighter on the battery. There’s no longer any need for the client to call these methods directly. The iOS test project now includes MGLMapboxEvents.h explicitly to avoid having to package a header that will go unused.
