Proposed updates to Java product versioning policy

[Cantor, Scott]

I had an action from a few dev calls back to update the Java versioning policy page [1] with new text covering more of the edge cases and questions that keep coming up on the calls.

I've finally done so and marked it as a draft (I did it as one edit, so the previous page version should have the old policy if we want it back for some reason).

Please review and raise any concerns on the list, or identify anything you still think is overlooked.

Of course, if you think we should abandon the "compatibility over everything" model that this is maintaining, that's fine. I wasn't intending to change the policy, just clarify it and extend it to cover the questions.

-- Scott

[1] https://wiki.shibboleth.net/confluence/display/DEV/Java+Product+Version+Policy