Person::GetPage and Person::GetCount

Implemented the Person::GetPage and Person::GetCount static methods.

The Person::GetPage static method retrieves a page of people results, optionally filtering based on keywords.

The Person::GetCount static method determines how many people total conform to a certain filter (or, absent a filter, how many people there are in general).
People Controller - Search Support

Added support for searching/listing people to the People controller.
Organization GetPage