Tooltip: No way to counter overflow hidden

[kmccullough]

Other angular-bootstrap components include an 'append-to-body' property, which allows displaying a tooltip, for example, outside of the overflow hidden area, by appending the tooltip to the 'body' element, rather than within/alongside the component. Currently there is no such mechanism in this library, and I cannot get a tooltip to appear, because it is cut-off by it's parent's overflow: hidden style.