[feature request] add (re)render tree method

[tlenex]

I think that it will be a nice and useful feature to (re)render all columns with a new structure data(array) given as parameter. Currently we are forced to render each column partially.
While performing (re)render, new loading template would be welcome too, ie. set in options or by another method.

[mynameistechno]

I can see how that would be useful. I guess as it is, you'd have to destroy and start a new instance.