Merge pull request #7 from edwardaa/implement-removeAllViews

Implement removeAllViews()

Author: justasm

library/src/main/java/com/jmedeisis/draglinearlayout/DragLinearLayout.java

@@ -296,6 +296,12 @@ public void removeDragView(View child) {
         }
     }
 
+    @Override
+    public void removeAllViews() {
+        super.removeAllViews();
+        draggableChildren.clear();
+    }
+
     /**
      * If this layout is within a {@link android.widget.ScrollView}, register it here so that it
      * can be scrolled during item drags.
@@ -726,4 +732,4 @@ private static Bitmap getBitmapFromView(View view) {
         view.draw(canvas);
         return bitmap;
     }
-}
+}