Kalle Lasn, the longtime editor of the anticonsumerist magazine Adbusters, did not invent the anger that has been feeding the Occupy Wall Streetdemonstrations across the United States.But he did brand it. Last summer, as uprisings shook the Middle East and much of the world economy struggled, Mr. Lasn and several colleagues at the small magazine felt the moment was ripe to tap simmering frustration on the American political left.