Code review comment for lp:~nik90/podbird/5.5-kevin-redesign

Only found two small issues that don't appear to be covered by other branches; I've added fixes for them myself whilst merging, they were just that 1) the new download indicator doesn't show any activity when download manager gives bad progress information (I've made the progress indicator bounce back and forth under these circumstances) and 2) the redesigned episodes page shows "NaN:NaN" for podcasts that don't provide duration information.

Like I said, I've fixed these though, so have now merged this branch :).