dvbtee-parser: FeedWorker: use Nan's SaveToPersistent / GetFromPersistent rather than managing it ourselves
dvbtee-parser: FeedWorker: use Nan's SaveToPersistent / GetFromPersistent rather than managing it ourselves

Signed-off-by: Michael Ira Krufky <00524723a60798c74a43fcc620c25dd7b9ece078@linuxtv.org>

mkrufky/node-dvbtee,mkrufky/node-dvbtee,mkrufky/node-dvbtee,mkrufky/node-dvbtee