Add NodePropRepository for Nodeprop querying
Point repository to NodePropRepository
Use NodePropRepository
Cleanup now unused functions; they've moved to the Repository classes
Remove json specific nonsense; we only support json for now. If other formats are needed, we can add options for them to the (POST) request
Wrap long line
We're in a repository already
s/getNodes/getNodeProps ; adjust getStdQueryBuilder call
s/json_//g
Get rid of now  useless functions
Add some function documentation
Add standardized way of saying OK; fix adjustNodeprop (didn't return a Response)