rollback to 2.2.1 positioning of tooltips (appending to body by default);
broken by (2.2.2)  https://github.com/twitter/bootstrap/commit/88b1e44dd61afd8f08761346555521bd216ed73a
will be fixed by (2.3.0 probably) https://github.com/twitter/bootstrap/pull/6321

before updating to 2.3.0 current changeset should be reverted