adds basic support for constraints (e.g. loop joints) in the visualizer....

...inspector() method.  this should help folks building urdfs for the first time with loop joints in the mix
Precisely

- Russ


> On Jul 1, 2014, at 6:06 AM, Andres Valenzuela <notifications@github.com> wrote:
> 
> In systems/visualizers/Visualizer.m:
> 
> > @@ -222,7 +224,14 @@ function update_display(source, eventdata)
> >          for i=state_dims(:)'
> >            x(state_dims(i)) = get(slider{i}, 'Value');
> >          end
> > -        x
> > +        if (~isempty(visualized_system) && getNumStateConstraints(visualized_system)>0)
> > +          % todo: pass in additional constriants to keep it inside the
> It seems like we'd want to make sure that the joint angle the user is adjusting remains unchanged. Is that what you're referring to here?
> 
> —
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