Demonstrates the filter strategy for limiting features passed to the layer.
                This example uses a filter strategy to limit the features that are passed
                to a layer.  Features bound for this layer have a when attribute
                with date values.  A filter strategy is constructed with a between filter
                that limits the span of dates shown.  A simple animation cycles through
                the domain of the when values, calling setFilter
                on the strategy with an updated filter.
            
View the filter-strategy.js source to see how this is done