Updated setup.py to include long description

Puts the readme and changelog onto pypi

setup.py

@@ -1,5 +1,12 @@
 from setuptools import setup
 
+readme_text = ''
+changelog_text = ''
+with open('README.md', 'r') as f:
+    readme_text = f.read()
+with open('CHANGELOG.md', 'r') as f:
+    changelog_text = f.read()
+
 setup(
     name='salve',
     version='2.3.0',
@@ -11,6 +18,7 @@
     entry_points={'console_scripts': ['salve = salve.cli:main']},
 
     description='SALVE Configuration Deployment Language',
+    long_description=readme_text + '\n\n\n' + changelog_text,
     author='Stephen Rosen',
     author_email='sirosen@uchicago.edu',
     url='http://salve.sirosen.net/',