Add frontend markdown metadata changes
Use manifest url from renderContext
Merge branch 'master' into markdown-doc-metadata-frontend
Use managed-ajax instead of multiple channels/taps
Clean up imports
Take out a println
Only process doc manifest on success
Add loading spinner
Merge pull request #3375 from circleci/markdown-doc-metadata-frontend

Markdown doc metadata frontend
Merge commit '0ca9c192b427c286cd81bbae25774c573a46ad04'