Auto install dependencies

setup.py

@@ -1,7 +1,8 @@
 #!/usr/bin/env python
-
-import sys, doctest, os, glob
 from setuptools import setup, find_packages
+from pip.req import parse_requirements as parse
+
+requirements = lambda f: [str(i.req) for i in parse(f, session=False)]
 
 setup(
     name='PyNFe',
@@ -10,5 +11,6 @@ setup(
     package_data={
         'pynfe': ['data/**/*.txt'],
     },
+    install_requires=requirements('requirements.txt'),
     zip_safe=False,
 )