Add in edge layer to adapt palyload to proper contract

[ralphg6]

The main idea is to support API payloads of any platforms. By example:

For input in Watson's API payload format:

POST http://localhost:5005/dialog?_if=watson

If the input format isn't explicitly informed, maybe we can build a component that tries to resolve the format.

Also maybe we can implement support to output format, but only if will be needed.

[ralphg6]

I'm working in this functionality in branch: issue/19-edge-adapter

[ralphg6]

During the development, I realized that not have a sense parametrize a different format in input and output.
So I implemented the support for 'adapter' query param that defines the format of input payload and output payload.

The usage is:

http://localhost:5000/dialog?adapter=watson

Where "watson" is the name of the adapter.

Until the moment, only "message" adapter is working. And he is the default adapter.

I will close this issue and create two new to develop the Watson adapter and to create a config for change default adapter of running instance.

[ralphg6]

Hehe, we have to merge before close!