Minor updates.

- Draw the playfield background in the song menu if a background cannot be drawn for the focused beatmap.
- Added ScoreDB.deleteScore() method to delete a score from the database.
- Added @author tags for curve-related classes (by fluddokt, #12).

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

src/itdelatrisu/opsu/objects/curves/Bezier2.java

@@ -20,6 +20,8 @@ package itdelatrisu.opsu.objects.curves;
 
 /**
  * Representation of a Bezier curve with the distance between each point calculated.
+ *
+ * @author fluddokt (https://github.com/fluddokt)
  */
 public class Bezier2 {
 	/** The control points of the Bezier curve. */

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

@@ -29,6 +29,8 @@ import org.newdawn.slick.Image;
 /**
  * Representation of a curve along a Circumscribed Circle of three points.
  * http://en.wikipedia.org/wiki/Circumscribed_circle
+ *
+ * @author fluddokt (https://github.com/fluddokt)
  */
 public class CircumscribedCircle extends Curve {
 	/** PI constants. */

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

@@ -24,6 +24,8 @@ import org.newdawn.slick.Color;
 
 /**
  * Representation of a curve.
+ *
+ * @author fluddokt (https://github.com/fluddokt)
  */
 public abstract class Curve {
 	/** The associated OsuHitObject. */

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

@@ -31,6 +31,8 @@ import org.newdawn.slick.Image;
 /**
  * Representation of a Bezier curve with equidistant points.
  * http://pomax.github.io/bezierinfo/#tracing
+ *
+ * @author fluddokt (https://github.com/fluddokt)
  */
 public class LinearBezier extends Curve {
 	/** The angles of the first and last control points for drawing. */

src/itdelatrisu/opsu/objects/curves/Vec2f.java

@@ -20,6 +20,8 @@ package itdelatrisu.opsu.objects.curves;
 
 /**
  * A two-dimensional floating-point vector.
+ *
+ * @author fluddokt (https://github.com/fluddokt)
  */
 public class Vec2f {
 	/** Vector coordinates. */