Merge branch 'master' of github.com:DirkR/capturadio

* 'master' of github.com:DirkR/capturadio:
  Streamlined mutagen{MP3,EasyID3,ID3} usage.
repaired character filter for file names.

I may not contain semicolons.
Include the latest 20 episodes into a feed.

Increased from 10 episodes.