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
Removed some unused #ifdefs
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
Merge pull request #323 from TsudaKageyu/ifdefs

Removed some unused #ifdefs
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