new GO API

GO decided to not support XML API anymore, We should adapt connector to use new JSON API...

Unfortunately we no longer support XML responses in the new QuickGO, but your request can still be satisfied via the old site: http://www.ebi.ac.uk/QuickGO-Old/GTerm?id=GO%3A0046902&format=oboxml -- and we may consider adding it to the new QuickGO in the future if demand grows. We instead provide responses now in the more popular JSON format, e.g., http://www.ebi.ac.uk/QuickGO/services/ontology/go/terms/GO:0046902.