Adding dep files and dependencies.

vendor/github.com/montanaflynn/stats/median.go

@@ -0,0 +1,25 @@
+package stats
+
+import "math"
+
+// Median gets the median number in a slice of numbers
+func Median(input Float64Data) (median float64, err error) {
+
+	// Start by sorting a copy of the slice
+	c := sortedCopy(input)
+
+	// No math is needed if there are no numbers
+	// For even numbers we add the two middle numbers
+	// and divide by two using the mean function above
+	// For odd numbers we just use the middle number
+	l := len(c)
+	if l == 0 {
+		return math.NaN(), EmptyInput
+	} else if l%2 == 0 {
+		median, _ = Mean(c[l/2-1 : l/2+1])
+	} else {
+		median = float64(c[l/2])
+	}
+
+	return median, nil
+}