BeatGrid::findNthBeat will now find Nth beat (#1313063)
Merge pull request #248 from HektikR/1313063

BeatGrid::findNthBeat will now find Nth beat (#1313063)
Fix indentation.
Add test for close-to-beat behavior in BeatGrid.
Improvements in default cover art name - avoid blank names
Merge branch 'master' of https://github.com/mixxxdj/mixxx into coverArtSupport