Fixes message attached between top and bottom.

Example & test case: http://jsfiddle.net/psycketom/Gv454/

Basically, it allows messages to be seamlessly attached between top and bottom elements.

Currently, attached message has only a "top attached" and "bottom attached" variation.

### Current
![current](https://f.cloud.github.com/assets/1030080/1968923/8316e8bc-82ea-11e3-8109-3b0363a651ba.png)

### Fixed
![fixed](https://f.cloud.github.com/assets/1030080/1968924/8333af2e-82ea-11e3-98a2-06d3e1e6f212.png)