Log Message:
Update ruby-taglib to 0.7.0.

## 0.7.0 (2014-08-21)

* Add support for TagLib::RIFF::AIFF (#52, by @tchev)
* Add support for TagLib::RIFF::WAV (#57, by @tchev)
* Associate filesystem encoding to filename strings
* Allow CXX override during gem installation
* Try to detect location of vendor/taglib on Heroku (#28)
* Documentation updates