split readme badges onto different lines
readme: clarify purpose
Merge pull request #417 from teeparham/patch-2

update Readme
readme: move "Design and Implementation Guidelines" to the bottom

* rename "Design and Implementation" section to "Design and Implementation Guidelines"
Merge pull request #418 from teeparham/patch-3

readme: move "Design and Implementation Guidelines" to the bottom
Added a HashSerializer in order to ensure implicit serialization of objects embedded in a hash using active_model_serializer. Modified README.md to document the functionality.