Draft JEP: Time-Based Release Versioning

[mark.reinhold at oracle.com]

Thanks for all the comments on my earlier proposal [1].  Here's a draft
JEP, based on that proposal and the feedback:

  http://openjdk.java.net/jeps/8192828

Further comments welcome!

- Mark


[1] http://mail.openjdk.java.net/pipermail/jdk-dev/2017-November/000089.html