update Watson STT and TTS, chapter 3 and following, to support the ne…

…w Watson API

added intent and entity files to C10

update package.json to force node engine >=8.11 for Cloudant compatib…

…ility

updated C09 with better recognition - added face service and now draw…

… rectangle around first face

updated chapter 11 to support Watson Discovery

updated Chapter 09 Visual Recognition

updated c2 readme