OpenMRS Platform and Ref App QA

thanks @ssmusoke for this

A number of changes have happened since the last platform release ie upgarding of the main core libraries like liquibase,making the platform able to run on postgres(thanks to @aman) , upgrading our spring , upgrading libraries in the platform bundled modules like the rest module , the intriduction of the fhir2 module in the platform ,you can also refer to this

We have done acouple of rest api end points testing on the current platform being released and we have also tested out the platform running smoothly with the reff app on postgres