Updates to namecleaner and added a script to remove exact dupes

Namecleaner.php is now inline with nZEDb's ReleaseCleaner.php and its
recent changes.
When releases are renamed their imdbID, rageID and tvdbID will be reset.
Removing pre data from prehash where name is less or equal to 15 letters.

Updated scripts, will not be adding pre data to prehash table if the
title is 15 letters or less.
Merge pull request #136 from DariusIII/dev

Dev