BotHelperDirective and IWebChat official release

This release adds:

1. BotHelperDirective for granular control of the botframework-webchat api. See Advanced installation
2. IWebChat for interfacing of the renderObject property to add desired settings the renderWebChat object
3. Adds webSocket and userId to the payload object for more directLine settings

Fixes:
n/a

Refactors:
removed unused code and added in more interfaces for increased typing