version 1.21 - handle episode ranges from filename

Mad Men!!  Came out with a double episode with a file named
   Mad.Men.S06E01-E02.PROPER.HDTV.x264-2HD.mp4
Wasn't handling these ranges properly.  Was handling them in the
description in some cases, but not properly.

Bumped the schema, since I need to fix up existing databases.

Added tests for epnums.