* add /twitch/status/:user badge
* update comments
* use a proper schema for the Twitch API calls
* use a token to make Twitch api calls
* fix handling of rate-limit error and bad token error
* [twitch] get a token as soon as creating a Twitch service
* [twitch] start both requests to users and stream before awaiting
* [twitch] set a timeout to replace the token before it expires
* [twitch] use authHelper
* [twitch] skip tests when no credentials
* [twitch] add one more status test
* twitch: do not check whether a user exists
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