Update Lookupd address routine to support full URI

Updated Lookupd address to support full HTTP/HTTPS URI format

This should address #44

Go implementation: https://github.com/bitly/go-nsq/blob/master/consumer.go#L381-L405

What does `L` stand for `isNSQLTCPAddresses`? If `lookup` then it doesn't seem appropriate when we're using it to validate nsqd addresses. Maybe a better name would be `isBareAddress`