Merge branch 'master' into develop
Merge pull request #520 from janus-ssp/master

Master
Update creating-a-release.md
Connection GET now triggers a 404 Not Found status code when connection is not found
Added issue to changes doc
Merge pull request #525 from janus-ssp/fix-not-found-status-code-for-connection-api

[REVIEW] Connection GET now triggers a 404 Not Found status code when connection is not found
Added test for creating nested metadata dto from flat array
Added test for flattening MetadataDto
Corrected docblock
Added test for creating metadata dto
Added test that checks if metadata is converted to dto when saving Entity
Added test to verify metadata is flattened on save by Connection Service
Added comment
Corrected duplicate test name
Corrected test location
Added documentation
Moved creating Metadata dto to assembler
Moved metadata flatten code to disassembler
Removed unused imports
Added test for metadata definition helper