Publish commit(s) from site source repo:
  9f3de4c Add weekly update for 7/18
  3d42e57 Replace bootstrap with CDN version
  cc80da3 Make site_tool.py support Python 2.6 and Centos 6

Site-Repo-Commit: 9f3de4cba7d58826d3f8e4db9b9166dbb9a19989
215 files changed