Issue 55 edb multiple records

address https://github.com/cityindex/LogSearchShipper/issues/55

@mrdavidlaing, could you take a look?
Aha - That's actually a better way to do it than including a [`<filter type="log4net.Filter.LoggerMatchFilter">`](https://github.com/cityindex/LogSearchShipper/pull/61/files#diff-41f1f9488a0a36f6781393fa5d20392fR84) in the appender itself.  I'll remember that for future.