Investigate different approach for engine

The current engine for muzima is custom made. Maybe we should investigate some of other approach available out there. Some of the approach we could consider is using Retrofit and ORMLite.

We would use Retrofit to directly convert REST resources to object. We would also need to have a look at Gson. We potentially will be able to re-use most of our algorithm and domain object code as Retrofit need to know how to marshall REST payload to the domain object.

We then would use ORMLite to marshall those domain objects directly to SQLite.