Minor changes to initialization of drumHTML
Minor changes to initialization of drumHTML

Add an array that stores cell.innerHTML to use in _setNoteCell.
sachi-d/musicblocks,walterbender/musicblocks,Hrishi1999/musicblocks,eohomegrownapps/musicblocks,sachi-d/musicblocks,Hrishi1999/musicblocks,walterbender/musicblocks,walterbender/musicblocks,eohomegrownapps/musicblocks,eohomegrownapps/musicblocks,Hrishi1999/musicblocks,sachi-d/musicblocks