Adding 'forceResize' parameter to 'ft.resize()' method - defaults to: false

@Bravdin, 

I thought of a less intrusive way to force the ft.resize() method (AKA redraw) that we were talking about this week.  It works with the column picker plugin.  If this works for you, go ahead and merge it in.  Did you want me to submit a pull request for the column picker or would that be better hosted in its own repository?  I figured, either way, I'd wait until we have the force redraw issue figured out.