Add hysteria and acme TLS certificate issuer (#18)

* Add hysteria client/server
* Add acme TLS certificate issuer

transport/hysteria/speed.go

@@ -0,0 +1,36 @@
+package hysteria
+
+import (
+	"regexp"
+	"strconv"
+)
+
+func StringToBps(s string) uint64 {
+	if s == "" {
+		return 0
+	}
+	m := regexp.MustCompile(`^(\d+)\s*([KMGT]?)([Bb])ps$`).FindStringSubmatch(s)
+	if m == nil {
+		return 0
+	}
+	var n uint64
+	switch m[2] {
+	case "K":
+		n = 1 << 10
+	case "M":
+		n = 1 << 20
+	case "G":
+		n = 1 << 30
+	case "T":
+		n = 1 << 40
+	default:
+		n = 1
+	}
+	v, _ := strconv.ParseUint(m[1], 10, 64)
+	n = v * n
+	if m[3] == "b" {
+		// Bits, need to convert to bytes
+		n = n >> 3
+	}
+	return n
+}