Merge pull request #102 from resibots/missing_include

missing hypervol.h include

src/hv/README

+Downloaded from: ftp://ftp.tik.ee.ethz.ch/pub/people/zitzler/hypervol.c

src/hv/hypervol.h

+#ifndef HYPERVOL_H__
+#define HYPERVOL_H__
+extern "C"{
+int  FilterNondominatedSet(double  *front[], int  noPoints, int  noObjectives);
+double  CalculateHypervolume(double  *front[], int  noPoints, int  noObjectives);
+}
+#endif