Feature freeze on October 1

[Chong Yidong]

The trunk is just about ready to go into feature freeze for the 24.3
release.  We will begin the freeze on October 1, a couple of weeks from
now.  If you are working on a feature that you'd like included in 24.3,
please commit it before October 1 or ask for an extension.

As usual, once the freeze is in effect, please commit only bug fixes to
the trunk, i.e. no new features or non-trivial internals changes.  If
you would like an exception, ask for one on emacs-devel.

Thanks.