Change struct

[kristinapathak]

Change struct tags from wrp to json so that a Marshal() or Unmarshal() using the standard json library would be compatible.

One example of the structs is the wrp.Message struct:

wrp-go/messages.go

Line 75 in 1a5926e

type Message struct {

The below lines need to be changed so that when parsing the wrp, we look for the json tag rather than the wrp tag.

wrp-go/format.go

Line 34 in 1a5926e

TypeInfos: codec.NewTypeInfos([]string{"wrp"}),

wrp-go/format.go

Line 45 in 1a5926e

TypeInfos: codec.NewTypeInfos([]string{"wrp"}),

this is related to this issue: xmidt-org/scytale#70