Do not fetch a collection's content when I only want to call a named operation on that collection

Currently, doing "launchpad.people.find(text='foo')" will cause the content of the people collection to be retrieved before the find() operation takes place. That's unnecessary and will certainly slow down all operations on a collection.

It's likely that the same happens with Entries, but that'd be less of a problem since it should be a lot faster to retrieve an Entry than to retrieve a Collection. We should probably fix it for Entries as well, though.