Feature request: Allow "shift + click" to select a span of rows

[jasongitmail]

Great lib!

Feature request: After clicking a row (e.g. rowB), holding the shift key and then clicking another row (e.g. rowE), could automatically select all rows in between too (e.g. rowB, rowC, rowD, & rowE).

This might be hard to implement, but would add an intuitive interaction that's missing from the currently implementation.