fixing more compile problems with Java bindings etc

samples/java/sbt/src/main/java/DetectFaceDemo.java

@@ -32,7 +32,7 @@ public class DetectFaceDemo {
 
         // Draw a bounding box around each face.
         for (Rect rect : faceDetections.toArray()) {
-            Core.rectangle(image, new Point(rect.x, rect.y), new Point(rect.x
+            Imgproc.rectangle(image, new Point(rect.x, rect.y), new Point(rect.x
                     + rect.width, rect.y + rect.height), new Scalar(0, 255, 0));
         }
 

samples/java/sbt/src/main/scala/ScalaDetectFaceDemo.scala

@@ -27,7 +27,7 @@ object ScalaDetectFaceDemo {
 
     // Draw a bounding box around each face.
     for (rect <- faceDetections.toArray) {
-      Core.rectangle(
+      Imgproc.rectangle(
         image,
         new Point(rect.x, rect.y),
         new Point(rect.x + rect.width,