Add LICENSE, README and CHANGES to source tarball

These files should be in the PyPI download. Fixes #866

setup.py

@@ -44,7 +44,10 @@ def read(*rnames):
     python_requires='>=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*',
     packages=find_packages(exclude=['ez_setup', 'examples', 'tests']),
     package_dir={'': '.'},
-    package_data=dict(rst2pdf=['styles/*.json',
+    package_data=dict(rst2pdf=['../LICENSE.txt',
+                               '../README.rst'
+                               '../CHANGES.rst'
+                               'styles/*.json',
                                'styles/*.style',
                                'images/*png',
                                'images/*jpg',