The checking `n` returned by `io.ReadFull()` is removed because `io.ReadFull()` returns n == len(buf) if and only if err == nil according to its document ( https://golang.org/pkg/io/#ReadFull ) and it's enough to check only `err`.
* add support for direct use of slice of struct pointers for MarshalMany
* Added a test to ensure that whether MarshalManyPayload is called with a []interface{} or []*Struct it will produce the same desired result.
* Added a test to show how the new error type may be returned.
* Ensure the outside accessible Errs have comments.
* Page char width cleanup. Addressed warnings about duplicated "client-id" definition; using the const.
Keiji Yoshida
Aren Patel
Sam Woodard