support ez_setup envs

Author: sideffect0

setup.py

@@ -1,4 +1,9 @@
-from setuptools import setup
+try:
+    from setuptools import setup
+except ImportError:
+    from ez_setup import use_setuptools
+    use_setuptools()
+    from setuptools import setup
 
 __version__  = '0.1.3'