Option to NOT rename .nfo to .nfo-orig

cherry-pick a Sickbeard pull request add an option to NOT rename .nfo to .nfo-orig

from oldskool:nfo_orig
credit to oldskool

Fixing issue 2404: Option to NOT rename .nfo to .nfo-orig

Conflicts:
	data/interfaces/default/config_postProcessing.tmpl
	sickbeard/__init__.py
	sickbeard/postProcessor.py
	sickbeard/webserve.py