Don't initialize already built tree every time plugin is called.

Hi,

one thing is changed with this patch -> settings.builtTreeClass that is put into toggle div which is checked every time per goodtree() call. Everything else is the same. Potential problem here could be lines 42 or 43, not sure what is better way to find div (assuming someone else can also play with tree).

Anyway, is there maybe better way to do this?

Thanks