Static layer works with rolling window now

Fixes #197
I moved my own fork to: https://github.com/tue-robotics/navigation <https://github.com/tue-robotics/navigation> ; If desired, I can send a new pull request from this fork.

Kind regards,

Rein

> On 24 Oct 2014, at 19:48, David Lu!! <notifications@github.com> wrote:
> 
> In costmap_2d/plugins/static_layer.cpp:
> 
> >    
> > -  mapToWorld(x_ + width_, y_ + height_, mx, my);
> > -  *max_x = std::max(mx, *max_x);
> > -  *max_y = std::max(my, *max_y);
> > +  mapToWorld(x_ + width_, y_ + height_, wx, wy);
> > +  *max_x = std::max(wx, *max_x);
> > +  *max_y = std::max(wy, *max_y);
> Good fix.
> 
> —
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