Add github-domains and plone.org to allow-hosts.
Remove pylint. Because it is useless.

It does no (longer?) know about setuptools namespaces.
This results in an "Unable to import" for almost every import
of shared namespaces.

It grumbles about lot of things I don't care about.

I no longer want to waste time to install it everytime I run buildout
when I don't use it anyway.
Remove qunit. Nobody uses it.

I've found no place where qunit is actually used.
I don't want to waste time installing it.