Added a benchmark tool

Source/Problem13.cpp

@@ -138,9 +138,11 @@
 #include "../Headers/Problem13.hpp"
 
 
-std::vector<mpz_class> Problem13::nums;
-
 Problem13::Problem13() : Problem("Work out the first ten digits of the sum of the one-hundred 50-digit numbers"), sum(0){
+	reserveVectors();
+}
+
+void Problem13::reserveVectors(){
 	//Make sure the vector is the correct size
 	nums.reserve(100);
 	nums.resize(100);
@@ -299,3 +301,10 @@ mpz_class Problem13::getSum() const{
 	}
 	return sum;
 }
+
+void Problem13::reset(){
+	Problem::reset();
+	sum = 0;
+	nums.clear();
+	reserveVectors();
+}