Adding simple way to ignore attached fixtures

Implementing libgdx#36

src/box2dLight/DirectionalLight.java

@@ -93,7 +93,7 @@ void update () {
 			xAxelOffSet = 1;
 			yAxelOffSet = 1;
 		}
-
+		
 		final float widthOffSet = sizeOfScreen * -sin;
 		final float heightOffSet = sizeOfScreen * cos;
 
@@ -238,5 +238,21 @@ public void setPosition (Vector2 position) {
 	@Override
 	public void setDistance(float dist) {
 	}
+
+	/** Not applicable for this light type **/
+	@Deprecated
+	@Override
+	public void setIgnoreAttachedBody(boolean flag) {
+	}
+
+	/** Not applicable for this light type
+	 * <p>Always return {@code false}
+	 **/
+	@Deprecated
+	@Override
+	public boolean getIgnoreAttachedBody() {
+		return false;
+	}
+
 
 }

src/box2dLight/Light.java

@@ -35,6 +35,7 @@ public abstract class Light implements Disposable {
 	protected boolean staticLight = false;
 	protected boolean culled = false;
 	protected boolean dirty = true;
+	protected boolean ignoreBody = false;
 
 	protected int rayNum;
 	protected int vertexNum;
@@ -352,7 +353,25 @@ public float getDistance() {
 	public boolean contains(float x, float y) {
 		return false;
 	}
-
+
+	/**
+	 * Sets if the attached body fixtures should be ignored during raycasting
+	 * 
+	 * @param flag - if {@code true} all the fixtures of attached body
+	 *               will be ignored and will not create any shadows for this
+	 *               light. By default is set to {@code false}. 
+	 */
+	public void setIgnoreAttachedBody(boolean flag) {
+		ignoreBody = flag;
+	}
+
+	/**
+	 * @return if the attached body fixtures will be ignored during raycasting
+	 */
+	public boolean getIgnoreAttachedBody() {
+		return ignoreBody;
+	}
+
 	/**
 	 * Internal method for mesh update depending on ray number
 	 */
@@ -376,11 +395,16 @@ void setRayNum(int rays) {
 		@Override
 		final public float reportRayFixture(Fixture fixture, Vector2 point,
 				Vector2 normal, float fraction) {
-
+			
 			if ((filterA != null) && !contactFilter(fixture))
 				return -1;
+
+			if (ignoreBody && fixture.getBody() == getBody())
+				return -1;
+
 			// if (fixture.isSensor())
 			// return -1;
+
 			mx[m_index] = point.x;
 			my[m_index] = point.y;
 			f[m_index] = fraction;