Merge pull request #600 from github/novendor-sitemap

Stop vendored material READMEs from rendering

Author: mlinksva

_config.yml

@@ -34,6 +34,7 @@ exclude:
   - tests
   - assets/vendor/selectivizr/tests
   - assets/vendor/clipboard/test
+  - assets/vendor/*/README.*
 
 plugins:
   - jekyll-sitemap