zope.app.apidoc and Chameleon are not friends

One challenge when trying to switch Launchpad to Chameleon (https://dev.launchpad.net/LEP/Chameleon) is that zope.app.apidoc and Chameleon do not accommodate one another. svn+ssh://svn.zope.org/repos/main/zope.app.apidoc/trunk r118939 fixes some issues.

zope.app.apidoc introspects Chameleon objects and adds underwear that confuses the rest of the code. An example is that
chameleon.core.config.SYMBOLS.as_dict returns unwanted values. I tried for an approach I liked better, but this quick hack makes things run better:

    @classmethod
    def as_dict(cls):
        return dict((name, getattr(cls, name)) for name in dir(cls)
                    if not name.startswith('__'))

Even after the zope.app.apidoc changes above and the as_dict hack, zope.app.apidoc still did not render. Other bugs can be broken out from this one if desired, and this can be just for the as_dict problem described above.