Merge pull request #219 from nanan9177/tutorial

Fixed the growing feedback message on mobile.
Merge pull request #220 from nanan9177/tutorial

Add sound caching for desktop, and disabled sound effects for mobile.
release 0.0.28
z-index increase for client dialog to outway server dialogs. Update image and style for mobile rotate hint.
Remove show code on mobile.
Merge pull request #221 from tobyk100/dialog-fix

z-index increase for client dialog to outway server dialogs. Update imag...
Merge pull request #222 from tobyk100/remove-show-code-mobile

Remove show code on mobile.
release 0.0.29
Updated the too many blocks failure feedback message.
Minor changes to the toolbox so the students do not need to select for the if blocks in HoC.