Merge pull request holidayextras#19 from holidayextras/add-related-di…

…stinct-resources

Fix addition and removal of resources to/from relations

Merge pull request holidayextras#16 from holidayextras/resourcesWitho…

…utRelations

Resources without relations

Merge pull request holidayextras#14 from holidayextras/better-remote-…

…error-handling

Better error handling of non-conformant json:api responses

Merge pull request holidayextras#7 from holidayextras/relation-resour…

…ce-validation

Additional validation when changing a relationship

Merge pull request holidayextras#4 from holidayextras/motivation

Project Motvations

Merge pull request #1 from holidayextras/spellCheck

Minor spelling fixes