Merge pull request #1 from DigiDNA/master

WIN32 fixes...
Merge pull request #2 from DigiDNA/master

Extended header basic support.
Preparing for ID3v2 2.0 frames.
ID3v2::Frame => ID3v2::AbstractFrame
Project reorganization...
Frame description...
Cleanup...
Added ID3v2 2.2.0 frames.