Defining install_requires in setup() causes the packages
to be downloaded from pypi by easy_install.  That defeats
the purpose of unit testing against installed system
packages, so disable the install_requires attribute.

diff -up pycollada-pycollada-ed5d8f8/setup.py.nodownloads pycollada-pycollada-ed5d8f8/setup.py
--- pycollada-pycollada-ed5d8f8/setup.py.nodownloads    2012-09-20 11:52:49.000000000 -0500
+++ pycollada-pycollada-ed5d8f8/setup.py        2012-11-02 15:19:08.621455388 -0500
@@ -22,7 +22,7 @@ setup(
     author_email = 'jterrace@gmail.com',
     platforms=["any"],
     license="BSD",
-    install_requires=install_requires,
+#    install_requires=install_requires,
     extras_require = {
         'prettyprint': ["lxml"],
         'validation': ["lxml"]