check live status of youtube or ustream

check live status of youtube or ustream. Tag a "LIVE" label on the live broadcasting video.
Use google api javascript client and ustream data api (ajax through YQL).

NOTE: To use the google APIs client, developer need to apply Google API Key for browser applications. After getting the API key, developer have to create app/developer-key.ls. See app/developer-key.ls.example as an example.