Enabled communication with remote Direct Line Speech bots

[tonyanziano]

Fixes #2040

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This PR adds the ability to connect to a remote Direct Line Speech bot by entering a speech key and speech region when connecting to a bot.

Example:

region: westus
key: some-speech-key-guid

[coveralls]

Coverage increased (+0.1%) to 68.163% when pulling 252a43a on toanzian/dl-speech into 8ca1397 on master.

[tonyanziano]

Linting is very unhappy due to a patch bump from eslint-plugin-import@2.20.0 to 2.20.1 as a side effect of regenerating the package-lock. This causes all of our import statements to fail linting resulting in a 400+ file change to satisfy the updated linter.

I'm going to make a separate PR that locks the eslint-plugin-import package to 2.20.0 so that we do not have to deal with this massive linting delta. (#2081 )