Users are unable to create mocks with specific body where the order of keys does not matter

[klippx]

A spec reproducing the issue:

• https://gist.github.com/klippx/1996f2a256b0cd06e6a6e8b78b590bb9

This issue forces clients to debug their mocks which are not very human parsable #269:

"[Mappersmith Test] No exact match found for \"POST http://example.org/blogs\" (body: \"{\"title\":\"title\",\"data\":{\"nestedItemTwo\":2,\"nestedItemOne\":1,\"nestingLevelTwo\":{\"deepNestedItemTwo\":2,\"deepNestedItemOne\":1}}}\"; headers: \"\"), partial match with \"POST http://example.org/blogs\" (body: \"{\"title\":\"title\",\"data\":{\"nestedItemOne\":1,\"nestedItemTwo\":2,\"nestingLevelTwo\":{\"deepNestedItemOne\":1,\"deepNestedItemTwo\":2}}}\"; headers: \"\"), check your mock definition"

[klippx]

A shallow fix was implemented in #121