Merge pull request #448 from yasushi-saito/master

Workaround for Eigen-3.3.1:

Former-commit-id: d6665f74ff0e2ea1c423b955995520a51e8a6897

include/igl/vector_area_matrix.cpp

@@ -47,7 +47,7 @@ IGL_INLINE void igl::vector_area_matrix(
 
 	aux.setFromTriplets(auxTripletList.begin(), auxTripletList.end());
 	auxT.setFromTriplets(auxTTripletList.begin(), auxTTripletList.end());
-	A = (aux + auxT)/2;
+	A = (aux + auxT)*0.5;
 }
 
 #ifdef IGL_STATIC_LIBRARY