Added CoolButton & Volume adjustment bar

xD
@jgkamat It effectively belongs in your mp3 library, or the root library. Since I don't want to modify the root library, and your library isn't public, I made do with what I had. It's just a hack to make it work.  
If you were to modify JayLayer to automatically adjust volume / MasterGain as it changes songs, it wouldn't need to constantly loop and compare what it's set as and what the user wants it as.