Google Code-in

Fix Sugarizer issue #389 and send a PR on the dev branch.

Description of the issue:

The idea of this enhancement is to add a keyboard mode into the TamTam Micro activity to allow user to play like a keyboard with the sound he choose. It will transform the activity into a mini synth keyboard.

To do that there is three things to do:

• Replace the current audio implementation here using HTML5.Audio by the Web Audio API
• Integrate a Piano keyboard in the activity. Could be this one.

• Implement synth instructions: could be something like this.