Consider removing label/build option to exclude label

[BlakeDraper]

Loving the new wimLegend functionality where it only shows the legend items of the chosen layers, but it introduced a minor issue: duplicate legend label (sort of)

You see there, we have the legend appearing directly below the layer toggle, so in most cases, the label for the legend will be redundant. Of course the legend label comes from the service itself, and layer name in the toggle is defined by the app so they are not necessarily the same. Question is, do we remove the label, or simply insert an option like "showLegendLabel" and exclude it when false? I guess I know the answer is almost certainly the option option, but you guys have any thoughts?

@jknewson @marsmith @njestes @esmyers @troddick