Added local (newer) version of dgrid.  The version (0.3.4) included with the Esri JavaScript API did not support "toggle" selections.  Though users can hold the control key down to toggle the selection, the preferred functionality
is to click to toggle the selection.  This is a temporary fix until Esri updates their version.  Once they do simply delete the js/dgrid folder and remove the reference to dgrid in dojoConfig.js.