Golang TTransportFactory Pattern Squelches Errors

The current (as of 72ca60d) pattern for TTransport factories in Golang is

type TTransportFactory interface {
	GetTransport(trans TTransport) TTransport
}

This causes issues, because some TTransportFactory implementations can return and error. Consider the THttpClientTransportFactory, which as of of 72ca60d, includes the following snippet:

	s, _ := NewTHttpClientWithOptions(p.url, p.options)
	return s

The call to NewTHttpClientWithOptions(...) call can throw errors. The resultant behavior is that nil is returned in place of a valid TTransport, with a nil error.

The TTransportFactory interface (and associated use patterns) should be extended to include errors.