Default aggregator map to empty.
Removed RegExAggregatorFactory.  Never used.
Allow for filtering data points by time range /after/ the query has
executed.  Would be better to do this in TsdbQuery instead.
ApplicationContextInitializer that use Spring XML instead of JSON.
Added onError() method.
Added GroupedSeriesWriter that can be used to write a query result like
Graphites plain text.
Sorta hacky summary response writer.
Support for time range filtering.
Changed onClose() to onError().
Changed view rendering.  Changed the way summary works in
ExtendedApiController.