* add support to unmarshal attributes to struct field that are ptr types
* Spacing, addressed all the linter warnings, comments to describe errors, cleanup, left a TODO note to resolve the Error messaging.
* Implemented a failing test demonstrating the intended behaviour of the omitempty annotation.
* Updated the failing test to ensure that unset field without the "omitempty" annotation are not inadvertently omitted.
* Working implementation of the "omitempty" annotation for fields that are of any type.
* Update the readme to include a brief description of how to use the `omitempty` in a attr field.
* Update the json example also using a uint for type variety.
* Added the MarshalOnePayloadWithoutIncluded method for marshaling single objects and their relations without actually populating the "included" key with the full related object.
* Completed method description.
* Added a test to ensure that the library is capable of Unmarshmaling a payload where the One object in the payload had relationships but did not include them via "included"