* Acknowledge messaages from Pulsar, doh!
* Change API to deliver a boolean e if value is an entity
* Change loaders to use new API
* Changes, entity-aware API is complete
* Add schema load util
* Added a sample schema turtle file will be useful for future testing and
tutorials.
* Fixed graph label metadata confusion, was created incorrect subjectOf
edges.
* Rework metadata structure in processing messages to be a subgraph
* Add subgraph creation for tg-load-pdf and tg-load-text based on command-line passing of doc attributes
* Document metadata is added to knowledge graph with subjectOf linkage to extracted entities
