Make sure the no-cover art image uses the user-defined width/height
Bug fix for off-by-one error for track/album id's.  Db column id's can be zero.
Missed a file for a previous commit
Fixed unit tests for cover change
Index cover art for all music types, instead of just one
Lower logging level when adding cover art
Merge pull request #117 from nperrier/coverart-fixes

various fixes to coverart indexing