Update dgrid.

It's difficult trying to figure out how to unselect (or remove) a module that was added by mistake.  Could probably include some documentation noting to use the cntrl key, however it appears the desired functionality is to toggle the selection.  The version of dgrid included in the Esri JSAPI does not support "toggle".  I added a newer version of dgrid. Easy to back out when Esri updates to a newer version of dgrid.