Support sovereign clouds

[compulim]

Background

Sovereign cloud use special hostname.

Today, when we connect, we use SpeechConfig.fromAuthorizationToken(...). For sovereign cloud, we need to use SpeechConfig.fromHost('virginia.stt.speech.microsoft.com', ...).

Also, we are adding end-to-end tests, so our tests will use a real subscription key and talk to the production service.

Changelog

Breaking changes

• fetchAuthorizationToken is removed, please refer to this documentation on how to get an access token.

Added

• Resolves #88. Support sovereign cloud, by @compulim in PR #89

Removed

• fetchAuthorizationToken is removed, by @compulim, in PR #89.

Changed

• Use p-defer-es5 instead of adopted createDeferred.js, in PR #89.