Using JVM time zone rules in Joda

[haozhun]

I understand that this is not something that Joda can provide because Joda cannot depend on java.time. I'm writing this issue for two reasons:

1. I would like comments from @jodastephen about the implementation, both from correctness and performance perspective.
2. I understand that I'm not the first one that has wanted to do this. But I can't find any one who did this successfully. I would like my code be available to others.

https://gist.github.com/haozhun/f73e0c73a2dcc816c752d101b3513ce1

I understand that this is something more suitable for something like a mailing list than an issue. However, the only I can find is from SourceForge, which is likely obsolete.

[haozhun]

I made some changes to the code I originally posted here. The only significant change is that all zones are initiated ahead of time (instead of using a cache). For my use case, the simplicity is worth it over the performance.

Updated code is here: https://github.com/airlift/joda-to-java-time-bridge

Your comment would be greatly appreciated.

[jodastephen]

This looks pretty good to me. In an ideal world, it would be nice to have a Java 8 version of Joda-Time that aids the transition to java.time.*, but it isn't easy to find the time.

I'll leave this open to aid others in finding the code.