Refs #3 - attempt to add functionaltiy for addresses

It does not work, because now AddressesFind and ContactFind both return a
ResultSet, of which the member Result has a distinct type.

Note: If you want to add an address, you must provide a LocationTypeId.
Refs #3 - retrieving address info works

Used a hack found on
http://social.msdn.microsoft.com/Forums/vstudio/en-US/bcd031d7-c8a4-4bb0-8c85-bc5d7b46108a/rest-services-identical-xmlroot-attributes-on-different-classes