form encoded example
fix examples for godoc
no need for Host
no longer require Date
aws4.Sign
introducting Transport
replace Transport with Post and Do
remove defunct ErrNoDate
introduce Client
dydb lib
dydb: add doc about URL
make ErrorDecoder private and remove Body field.
Code -> StatusCode
ResponseError docs
fix typo
doc Do
dydb: read whole body for ResponseError
fix typo
Do -> Query/Exec
give receiver var a better name