Rename client_test.go to session_test.go.
Expose response data as methods on Request object
adapt Session.Send()
reword test suite for new api.  not yet passing.
Passing tests
Update example to napping api
split session and api tests
Fix format string
add coverage for more top level api functions
more test coverage
Add sanity checks to automatic result unmarshalling
Correct spelling of "unmarshal"
rename Opts.update to more accurate Opts.merge
Simplify API