setup: we require setuptools > 0.6a9 in order to parse requirements that have a dot in them such as "zope.interface"

In the near future we might start actually relying on setuptools's pkg_resources's "require()" function to make modules importable, so we can't just skip zope.interface.

_auto_deps.py

@@ -1,7 +1,5 @@
 install_requires=[
-                  # we require 0.6c8 to build, but can handle older versions
-                  # to run
-                  "setuptools >= 0.6a9",
+                  "setuptools >= 0.6c8",
 
                   # pycryptopp < 0.5 had a bug which, using a Microsoft
                   # compiler, or using some versions of g++ while linking