Implemented edge aggregation.  Note:  Requires commit #985cfb8 in Vande
Fixed a date ingest issue that prevented correct dates from appearing in the data.  Note: to see this fix, you will have to re-run the ingest process and produce a new data set
Added overrides for the TXNGNodeDisplay setAttrs() function to be more Walker-specific.  This lets you click on an email identifier in the Details Panel and view the email contents