Issue #109: Update Freebase regular expressions

The new Freebase RDF dump is using N-Triples.
Updated regex in CreateFreebaseLinks to account for this change.
Issue #114: Avoid re-using an already shutdown ExecutorService

Make sure the internal ExecutorService is disposed when it is shutdown
and is re-created when needed again.
Merge pull request #115 from ninniuz/114_recreate_executor_service_when_completed

Issue #114: Avoid re-using an already shutdown ExecutorService
Merge pull request #110 from ninniuz/109_update_freebase

Issue #109: Update Freebase regular expressions