#85 autogenerate sfv-check

[magnus folgero]

It would be nice if grip offered to autogenerate a
sfv-check and put a resulting foo.sfv-file in the
encoder target-folder.

Guess this could be quite done quite easy calling cksfv
[http://www.iki.fi/shd/foss/cksfv/] after the rip is
complete?

PS: I'm Lovin' Grip! keep up the good work :)