CORE-4667: Correcting JSON keys for consistency and updating README
README now suggests instertion of milliseconds since epoch for time/date fields.
Merge pull request #1 from strootman/dev

CORE-4667: Correcting JSON keys for consistency and updating README
also accept milliseconds since the epoch in time fields
use logins_disabled instead of logins-disabled as the key in system message JSON
some minor refactoring