In entertainment, six weeks can be a lifetime.  The CW’s “Supernatural” is finally returning after a lengthy hiatus on Jan. 16.  In the last episode of 2012, Sam and Dean’s bromance seemed irrevocably broken after an epic argument over Dean’s Purgatory-forged friendship with vampire Benny and Sam’s lost love, Amelia.  Let’s hope time heals all wounds.  Here are the five spoilers you need to know…