UnicodeDecodeError with bushy blob layout and non-ASCII OID

Fix a UnicodeDecodeError that could happen with blobs when the OID contained non-ascii bytes if ascii was the default encoding; test this.

Windows doesn't allow proper function with NamedTemporaryFile held open.

Another step toward PyPy support.

A step toward PyPy support.

Re-order changelog entries for 4.0.0b1.

Use the buildout to run these tests.

Try to work around zc.buildout's ignorance of setup_requires.

(I wish we had some real Windows developers who cared.  A 24-hour test
cycle is not exactly optimal.)

Improve logging of issue around blob

The guide package is `zodbdocs`.

PyCon 2013 sprint - buildout changes

Pull in the development version of zodbpickle which has recent changes which allow tests to pass at this time.

The close() method is not in the interface and is not provided
by ZEO's implementation.