Add support for ID3v2 SYLT frames (synchronized lyrics).
Add support for ID3v2 ETCO frames (event timing codes).
Merge pull request #362 from ufleisch/master

Add support for synchronized lyrics (SYLT) and event timing codes (ETCO) for ID3v2
Changed cmake_minimum_required from 2.6.0 to 2.8.0.
Merge pull request #371 from TsudaKageyu/cmake-ver

Changed cmake_minimum_required from 2.6.0 to 2.8.0.