Integration (with myself) fixes

- Adding default value in empty frames to avoid artifact when paint
bucketing (you may have issues with previously stored model before this
commit, no migration plan for papybrossette :D)
 - Fix issue: Model does not show up when loading a remote GAE model
 - Removing FRAMESHEET_UPDATED events (remains of history manager
implementation)

js/drawingtools/Eraser.js

@@ -32,10 +32,4 @@
 	ns.Eraser.prototype.moveToolAt = function(col, row, frame, color, canvas, dpi) {
 		this.applyToolAt(col, row, frame, color, canvas, dpi);
 	};
-
-	ns.Eraser.prototype.releaseToolAt = function(col, row, frame, color, canvas, dpi) {
-		// TODO: Create a afterRelease event hook or put that deep in the model
-		$.publish(Events.FRAMESHEET_UPDATED);   
-	};
-
 })();