[phobos] Time for the next release

[Jonathan M Davis]

To repeat what Walter said on dmd-beta in case you're not on dmd-beta:

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That means:

1. no more new stuff!
2. get it through the test suite
3. only critical bugs in the stuff that's new since the last release get fixed
4. only critical regressions get fixed

Let's push this out and then we can clear the plate for more new stuff!
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And if you're not on dmd-beta yet, you probably should be. Also, I would point 
out that the freeze on new stuff doesn't mean that we can't create or review 
pull requests. The stuff necessary to get ready for the next release obviously 
takes higher priority, but git allows us to continue to work on the new stuff 
and review it even if we aren't committing any of it until after the next 
release.

- Jonathan M Davis