Added a benchmark tool

Source/Problem23.cpp

@@ -35,6 +35,10 @@
 int Problem23::MAX_NUM = 28123;
 
 Problem23::Problem23() : Problem("Find the sum of all the positive integers which cannot be written as the sum of two abundant numbers"), sum(0){
+	reserveVectors();
+}
+
+void Problem23::reserveVectors(){
 	//This makes sure the vector is the correct size
 	divisorSums.reserve(MAX_NUM);
 	divisorSums.resize(MAX_NUM);
@@ -116,3 +120,10 @@ uint64_t Problem23::getSum() const{
 	}
 	return sum;
 }
+
+void Problem23::reset(){
+	Problem::reset();
+	sum = 0;
+	divisorSums.clear();
+	reserveVectors();
+}