Added an API to get a camera that you can pass into -[MGLMapView setCamera:] that fits the given coordinate bounds, by analogy with -[MKMapView regionThatFits:] or -[MKMapView mapRectThatFits:edgePadding:].
Added mbgl::Map::getCameraOptions() for getting the current camera options more conveniently.
Replaced Markdown syntax with HTML syntax for hyperlinks in documentation comments. HTML links work both inside Xcode (whether Objective-C or Swift) and on the Web (via jazzy).
Fixes#3961.