The `omitDefault` flag now defaults to `false`, and is indepdendent of processing mode.
The `omitDefault` flag now defaults to `false`, and is indepdendent of processing mode.

ruby-rdf/json-ld,ruby-rdf/json-ld,PerfectMemory/json-ld,gkellogg/json-ld,PerfectMemory/json-ld