Added error() method to DownloadListener interface.

Downloads failing due to connection errors will now send a bar notification instead of throwing an ErrorHandler dialog.

Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>

src/itdelatrisu/opsu/objects/curves/Curve.java

@@ -86,5 +86,4 @@ public abstract class Curve {
 	protected float lerp(float a, float b, float t) {
 		return a * (1 - t) + b * t;
 	}
-
 }