Chen table draggable

https://trello.com/c/cSAGRMdR/58-as-a-user-i-can-drag-to-reorder-trip-stops

![user can reorder trip stops by dragging](https://cloud.githubusercontent.com/assets/3759510/5249496/8ca93c14-7951-11e4-9ee0-047d87f96bd4.gif)