Conform to new API

This commit also rebased branch

Author: Richard Domander

src/main/java/net/imagej/ops/geom/CentroidTuple3D.java

@@ -17,7 +17,7 @@
 public class CentroidTuple3D extends AbstractUnaryFunctionOp<Collection<? extends Tuple3d>, Vector3d>
         implements Ops.Geometric.Centroid {
     @Override
-    public Vector3d compute1(final Collection<? extends Tuple3d> input) {
+    public Vector3d calculate(final Collection<? extends Tuple3d> input) {
         final int vectors = input.size();
         if (vectors == 0) {
             return new Vector3d(Double.NaN, Double.NaN, Double.NaN);