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.
I've addressed this concern by removing ```add_indicators_for_domain()``` and instead using the ```new create_indicator_from_obj()```, which is a more flexible way to implement this.