Add Jump and Phi support, to enable things like for loops

hello/hello.go

@@ -9,6 +9,7 @@ func main() {
 	println("5 ** 2 =", square(5))
 	println("3 + 12 =", add(3, 12))
 	println("fib(11) =", fib(11))
+	println("sumrange(100) =", sumrange(100))
 }
 
 func calculateAnswer() int {
@@ -28,6 +29,13 @@ func fib(n int) int {
 	if n <= 2 {
 		return 1
 	}
-	ret := fib(n - 1) + fib(n - 2)
-	return ret
+	return fib(n - 1) + fib(n - 2)
+}
+
+func sumrange(n int) int {
+	sum := 0
+	for i := 1; i <= n; i++ {
+		sum += i
+	}
+	return sum
 }