teiiddes-2162: http://www.restfulwebservices.net/wcf/StockQuoteService.svc?wsdl was getting an NPE due to the schema imports not having a namespace prefix. Since prefix is an optional attribute for import, I added a check for null.

http://ws.cdyne.com/delayedstockquote/delayedstockquote.asmx?WSDL was failing to parse because we were expecting a "type" attribute on the element. "Type" is an optional attribute on element, so I have relaxed the requirement in the code.
Merge pull request #357 from tejones/teiiddes-2162

teiiddes-2162