Added timezone/country data; updated roles data.

Added function to determine timezone/country based on given postal
code. Updated values sent when assigning user roles.
Fixing dynamic domain problems and JSON header.

Updated dynamic domains not correctly being set by parent webhook.
Fixed/added Content-Type header not being set.
Adding primitive response processing
Updating webhook, implementing response processing

Updated user_adds_role webhook definition and processResponse().
Updating README for processResponse()

Updating comments and adding documentation for processResponse()
Updating webhook comments