Adds the ability to set force: true on select to trigger a redraw.
Adds the ability to set force: true on select to trigger a redraw.

Since select is optimized to not redraw if the node is already selected,
we need a way to force a redraw to redraw the tree after a search is
cleared.

Fixes #180

SpiderStrategies/kalpa-tree,SpiderStrategies/kalpa-tree