Initial work on downsampling

The http connection is being closed before sending all data. May have something to do with the Range header

utils/math.go

@@ -0,0 +1,15 @@
+package utils
+
+func MinInt(x, y int) int {
+	if x < y {
+		return x
+	}
+	return y
+}
+
+func MaxInt(x, y int) int {
+	if x > y {
+		return x
+	}
+	return y
+}