Fix (I think) for bug #1215885 - refresh rows when convert finishes so composites can update.
Merge branch 'kovidgoyal/master'
Update formats composite column in GUI when conversion finishes

Ensure that the Formats custom column (if present) is updated when a new
format is created as a result of a conversion. Fixes #1215885 [calibre 0.9: strange display behavior for formats](https://bugs.launchpad.net/calibre/+bug/1215885)

Merge branch 'master' of https://github.com/cbhaley/calibre
pep8