Merge pull request #7 from micky2be/master

Added callback when a sound finished playing
Fixed repeated sound transition request.
merge previous changes
refactored
simplified
fixed starting behavior
forgot a few stuff
youps
added a history.md
Merge pull request #8 from polco/master

Fixed repeated sound transition requests.
Fixed the bug when playing a sound with infinite loop
Merge branch 'master' of github.com:Wizcorp/boombox into loopFix
Merge pull request #9 from polco/loopFix

Sound Loop fix
0.1.14: Down the loophole
* error to warn
* Error handling and Class removal