Added requirements.txt and appropriate stuff in setup.py to handle it

Author: mahtin

requirements.txt

@@ -0,0 +1 @@
+requests

setup.py

@@ -1,7 +1,11 @@
 #!/usr/bin/env python
 
+import os
 from setuptools import setup, find_packages
 
+with open('requirements.txt') as f:
+    required = f.read().splitlines()
+
 setup(
     name='python-cloudflare-v4',
     version='1.1',
@@ -10,6 +14,7 @@
     author_email='felix@fawong.com,mahtin@mahin.com',
     url='https://github.com/mahtin/python-cloudflare-v4',
     packages=['cli4']+find_packages(),
+    install_requires=required,
     entry_points={
 	'console_scripts': [
 	    'cli4 = cli4.__main__:main'