DateTimeZoneProviders always initializes TZDB and BCL providers #209
Description
An application which only ever uses the BCL time zones will still end up
initializing TZDB if they use DateTimeZoneProviders.Bcl, due to the static
initializer. We should make the loading of TZDB lazy.
Original issue reported on code.google.com by jonathan.skeet on 10 Apr 2013 at 9:03