Update package versions.
Remove workaround for merged fix in WSGIProxy2.
SQLAlchemcy events can now be removed.
New zope.sqlalchemy release; switch to zope.sqlalchemy.register(Session).
Use a tag tarball instead of a checkout.
Merge pull request #100 from ENCODE-DCC/update-versions

Update versions
Merge branch 'master' into exp-treatment-depleted-776