Added DSF support
Correctly handle files with no ID3v2 tag
Fixed a comment
Rename `DSF::Properties` to `DSF::AudioProperties`
Added some basic tests for DSF
Added tag setting test
Merge branch 'taglib2' of github.com:taglib/taglib into dsf
Invalidate the file when necessary
Correctly read all 8 bytes for the metadata offset
Validate the tag's version of file length against the actual length
Read properties more efficiently
Strip tag if empty
Correctly write the metadata offset in absence of ID3v2 tag
Update internal state after saving
Another fix for tag stripping
Merge pull request #288 from sbooth/dsf

Added DSF support