Remove setuptools bootstrapping from setup.py

Rationale: the distributed version of ez_setup is outdated and the
python packaging world is a moving target. Also recent versions of
python ship with setuptools and pip.

Author: Andrea Bedini

setup.py

@@ -23,14 +23,7 @@
 except ImportError:
     _CYTHON_INSTALLED = False
 
-# try bootstrapping setuptools if it doesn't exist
 try:
-    import pkg_resources
-    try:
-        pkg_resources.require("setuptools>=0.6c5")
-    except pkg_resources.VersionConflict:
-        from ez_setup import use_setuptools
-        use_setuptools(version="0.6c5")
     from setuptools import setup, Command
     _have_setuptools = True
 except ImportError: