Request for support for META object

[cnolewajka]

As per definition of meta object: http://jsonapi.org/format/#document-meta

it would be nice to have support for meta object for resources: (resource and relationships) http://jsonapi.org/format/#document-resource-objects

top level: http://jsonapi.org/format/#document-top-level

resource identifier objects: http://jsonapi.org/format/#document-resource-identifier-objects

links: http://jsonapi.org/format/#document-links