Issue 55 edb multiple records

address https://github.com/cityindex/LogSearchShipper/issues/55

@mrdavidlaing, could you take a look?
@fandrei - whats the reason for having a separate logger block here rather than just sticking the `<appender-ref ref="EdbExpectedEventSourcesAppender" />` with the others in `<root><appender-ref ...` ?