Read API base URL from Info.plist

[1ec5]

If no host is passed into Geocoder(accessToken:host:), the fallback hostname should be either api.mapbox.com or api.mapbox.cn depending on the value of MGLMapboxAPIBaseURL in Info.plist:

MapboxGeocoder.swift/MapboxGeocoder/MBGeocoder.swift

Line 154 in faa288d

baseURLComponents.host = host ?? "api.mapbox.com"

This would be consistent with how we read the access token out of Info.plist:

MapboxGeocoder.swift/MapboxGeocoder/MBGeocoder.swift

Line 147 in faa288d

let accessToken = accessToken ?? defaultAccessToken

This will make it easier for developers to keep their map and geocoder usage in sync, since Geocoder.shared would automatically pick up the API endpoint specified in Info.plist. Developers who need a different value for the geocoder can still override the API base URL when creating a separate Geocoder instance.

/cc @pdgoodman