Alexa Skill SDK integration

[phildionne]

See https://github.com/alexa/alexa-skills-kit-sdk-for-nodejs/issues/51

[phildionne]

Should aim to support these:

• The original Alexa Skills Kit: https://github.com/amzn/alexa-skills-kit-js
• The new Alexa Skills Kit: https://github.com/alexa/alexa-skills-kit-sdk-for-nodejs
• The alexa-app framework: https://www.npmjs.com/package/alexa-app

[phildionne]

Find a way to get the full user utterance.

See

• https://forums.developer.amazon.com/questions/5044/getting-full-user-utterance.html
• https://developer.amazon.com/blogs/post/Tx3IHSFQSUF3RQP/why-a-custom-slot-is-the-literal-solution