Jython 2.7 b4 soft launch take 3

Once again, we decided to close a more bugs before 2.7b4, so I put together a
third soft launch of Jython 2.7b4. I think this is the one, for real :)

The releases:

Installer: https://oss.sonatype.org/content/repositories/orgpython-1035/org/python/jython-installer/2.7-b4/jython-installer-2.7-b4.jar

Standalone: https://oss.sonatype.org/content/repositories/orgpython-1036/org/python/jython-standalone/2.7-b4/jython-standalone-2.7-b4.jar

The parent directories of each of the above have the checksums, source
jars, javadocs, etc.

I'll want to fast track this one as the final within a few days, so
please check them out.

-Frank

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