Update parser.rb for WSDL without binding tags

[mrebersv]

Update XPATH search in parser.rb for WSDLs without binding tags. WSDLs without Binding tags surrounding the operations don't work. This change fixes that. However, if there were a situation where there were two sets of "operation" elements in a given WSDL with one set outside of the binding tags, this would still get all of those. I'm not sure that would actually ever happen nor that it would ever actually be undesirable.

[pcai]

thanks can you include a test that actually processes a WSDL like this?