Fixed MusicInfoActivity;
Implemented music metadata ediging (there are files with errors yet);
Removed unnecessary layout components;
Improved TracksManager.java;
Created MP3File entity to facilitate file tags manipulation.
Added .gitattributes file and updated .gitignore.

Fixed line endings.
Removed MyID3 library.
Merge pull request #2 from Danguilherme/mp3-metatag-edit-poc

Fixed MP3 tags editing