get rid of 'maxHostConnections must be greater than 0' message 

during GeoRSS poll.


java.lang.IllegalArgumentException: maxHostConnections must be greater than 0
	at org.apache.commons.httpclient.params.HttpConnectionManagerParams.setMaxConnectionsPerHost(HttpConnectionManagerParams.java:104)
	at org.geowebcache.util.HttpClientBuilder.buildClient(HttpClientBuilder.java:159)
	at org.geowebcache.georss.GeoRSSReaderFactory.createReader(GeoRSSReaderFactory.java:52)