setup: back to the distutils version of setup()/Extension.

setuptools was only for nose and test integration, but since we are making it through our Makefile, no need to change the setup for that.
That also remove the nose requirement for standard user.

setup.py

@@ -2,7 +2,8 @@ from fnmatch import filter as fnfilter
 from sys import platform, argv, modules
 from os.path import join, dirname, realpath, sep, exists
 from os import walk, environ
-from setuptools import setup, Extension
+from distutils.core import setup
+from distutils.extension import Extension
 
 # extract version (simulate doc generation, kivy will be not imported)
 environ['KIVY_DOC_INCLUDE'] = '1'
@@ -98,14 +99,6 @@ if 'sdist' in argv and have_cython:
 # add cython core extension modules if cython is available
 if have_cython:
     cmdclass['build_ext'] = build_ext
-    # this is an hack to make setuptools works with Cython
-    # without this hack, cython is not executed, and we don't have C files at
-    # the end. More information can be found at
-    # http://mail.python.org/pipermail/distutils-sig/2007-September/008204.html
-    # The solution taken is http://pypi.python.org/pypi/setuptools_cython/
-    if 'setuptools.extension' in modules:
-        m = modules['setuptools.extension']
-        m.Extension.__dict__ = m._Extension.__dict__
 else:
     pyx_files = ['%s.c' % x[:-4] for x in pyx_files]
 
@@ -212,8 +205,6 @@ setup(
                 'hardware-accelerated multitouch applications.',
     ext_modules=ext_modules,
     cmdclass=cmdclass,
-    setup_requires=['nose>=0.11'],
-    test_suite='nose.collector',
     packages=[
         'kivy',
         'kivy.core',