Generic properties `created` and `modified` for all resources

[kba]

All resources, regardless of their semantics, should have created/modified properties, which should be set, resp. for every POST/PUT request.

This is important for paging (c.f. #74).

Need to decide on good names for those

• created and modified
  • PRO: Easy to remember
  • CON: Can interfere with semantics
• _created and modified
  • PRO: Clear because underscore-prefixed names are private by convention
  • CON: Might interfere with other Monoose plugins or MongoDB conventions (need to investigate)
• _mongoosejsonld_created and _mongoosejsonld_created
  • PRO: No conflicts possible
  • CON: Long and ugly

I'm also open for suggestions @infolis/developers

[bolandka]

I would tend to not using created and modified, indeed this might be confusing. When using the long and ugly variant it should be clear that, in the case of InfolisFiles for example, this refers to the creation / modification of the InfolisFile resource rather than the creation / modification of the underlying document.

How about calling it resource_created and resource_modified?

[kba]

This is now live (resource_created and resource_modified). Still open how/if we expose this as LD.