Stop and restart audio if already playing
Prevent double audio when using Double Check
Add and remove the listener on the didFinalAnswer event to avoid the double invocation
Move the listener setup to the end of the promise chain
Update version
Add options to the didFinalAnswer listener too
Made the bell pause -> play statements less confusing
Merge pull request #19 from bashenk/patch-burn-bell-audio
Patch Burn Bell audio, closes #15
