WHOIS

Remove WHOIS support from core. WHOIS lookups are now done in a service.

Add support for creating indicators from a domain. This is intended to be used by AJAX calls on domain services that wish to create an indicator (ie: email fields in WHOIS records).

There is a corresponding PR for this in crits_services.
What's wrong with `add_indicators_for_domain()` in indicators/handlers already?