NEON-1057 Correcting an error in the error message.  A D3 selector was being used where a jquery selector was required.
NEON-1062 Cleaning up some dead and unnecessary code while working testing.
NEON-1057 Switching the barchart to pull its x and y axis values from the connection information stubs in the connection service.  Also switched the chart to do COUNT aggregates.  The mappings to the directive attributes remain.  they are used as default field names if the connection service returns no mappings.
NEON-1062 clearing filters on the filterID before pulling data for the new dataset and adding some documentation.