Suggestions for Improvement to the eBird 1.1 API

• See this comment on making the regional hot spot lookup provide a filtering mechanism to show only hot spots with recent data.
• In the header for XML results, we should add a warehouseDate to indicate when the last refresh occurred on the primary warehouse from which the result is based. This will let consumers decide whether or not they should expect recent data to show up in the result or not.
• Add location name to header of location based API results.  Allows a "gadget" to display the location name in the case where no results were returned.   Return comma delimited list for requests with multiple loc_ids