[issue20851] Update devguide to cover testing from a tarball

[Larry Hastings]

Larry Hastings added the comment:

I don't plan on doing tarball-only drops during the 3.5 beta/rc period like I did during 3.4.  However, when I do a release (e.g. 3.5.0a4), I release Windows binaries (built by Steve Dower), OS X binaries (built by Ned Deily), and source in tarballs.  If you're on anything but Windows or OS X you have to build it yourself, from a tarball.  So it probably makes sense to have instructions in the dev guide on how to do it.

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<http://bugs.python.org/issue20851>
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