chore(deps:go-multiaddr) update to b90678896b52c

procedure is to execute
```
cd my/github.com/jbenet/go-multiaddr
git pull
cd my/github.com/jbenet/go-ipfs
godep update github.com/jbenet/go-multiaddr
```

Godeps/Godeps.json

@@ -55,8 +55,8 @@
 		},
 		{
 			"ImportPath": "github.com/jbenet/go-multiaddr",
-			"Comment": "0.1.0-1-g99196c0",
+			"Comment": "0.1.2",
-			"Rev": "99196c0d231f83eea7f6e47cf59cbb5a0b86b358"
+			"Rev": "b90678896b52c3e5a4c8176805c6facc3fe3eb82"
 		},
 		{
 			"ImportPath": "github.com/jbenet/go-multihash",

Godeps/_workspace/src/github.com/jbenet/go-multiaddr/codec.go

@@ -8,10 +8,14 @@ import (
 	"strings"
 )
 
-func StringToBytes(s string) ([]byte, error) {
+func stringToBytes(s string) ([]byte, error) {
 	b := []byte{}
 	sp := strings.Split(s, "/")
 
+	if sp[0] != "" {
+		return nil, fmt.Errorf("invalid multiaddr, must begin with /")
+	}
+
 	// consume first empty elem
 	sp = sp[1:]
 
@@ -22,7 +26,7 @@ func StringToBytes(s string) ([]byte, error) {
 		}
 		b = append(b, byte(p.Code))
 
-		a := AddressStringToBytes(p, sp[1])
+		a := addressStringToBytes(p, sp[1])
 		b = append(b, a...)
 
 		sp = sp[2:]
@@ -30,7 +34,7 @@ func StringToBytes(s string) ([]byte, error) {
 	return b, nil
 }
 
-func BytesToString(b []byte) (ret string, err error) {
+func bytesToString(b []byte) (ret string, err error) {
 	// panic handler, in case we try accessing bytes incorrectly.
 	defer func() {
 		if e := recover(); e != nil {
@@ -49,7 +53,7 @@ func BytesToString(b []byte) (ret string, err error) {
 		s = strings.Join([]string{s, "/", p.Name}, "")
 		b = b[1:]
 
-		a := AddressBytesToString(p, b[:(p.Size/8)])
+		a := addressBytesToString(p, b[:(p.Size/8)])
 		if len(a) > 0 {
 			s = strings.Join([]string{s, "/", a}, "")
 		}
@@ -59,7 +63,7 @@ func BytesToString(b []byte) (ret string, err error) {
 	return s, nil
 }
 
-func AddressStringToBytes(p *Protocol, s string) []byte {
+func addressStringToBytes(p *Protocol, s string) []byte {
 	switch p.Code {
 
 	// ipv4,6
@@ -79,7 +83,7 @@ func AddressStringToBytes(p *Protocol, s string) []byte {
 	return []byte{}
 }
 
-func AddressBytesToString(p *Protocol, b []byte) string {
+func addressBytesToString(p *Protocol, b []byte) string {
 	switch p.Code {
 
 	// ipv4,6

Godeps/_workspace/src/github.com/jbenet/go-multiaddr/index.go

@@ -5,22 +5,26 @@ import (
 	"strings"
 )
 
+// Multiaddr is the data structure representing a multiaddr
 type Multiaddr struct {
 	Bytes []byte
 }
 
+// NewMultiaddr parses and validates an input string, returning a *Multiaddr
 func NewMultiaddr(s string) (*Multiaddr, error) {
-	b, err := StringToBytes(s)
+	b, err := stringToBytes(s)
 	if err != nil {
 		return nil, err
 	}
 	return &Multiaddr{Bytes: b}, nil
 }
 
+// String returns the string representation of a Multiaddr
 func (m *Multiaddr) String() (string, error) {
-	return BytesToString(m.Bytes)
+	return bytesToString(m.Bytes)
 }
 
+// Protocols returns the list of protocols this Multiaddr has.
 func (m *Multiaddr) Protocols() (ret []*Protocol, err error) {
 
 	// panic handler, in case we try accessing bytes incorrectly.
@@ -44,12 +48,14 @@ func (m *Multiaddr) Protocols() (ret []*Protocol, err error) {
 	return ps, nil
 }
 
+// Encapsulate wraps a given Multiaddr, returning the resulting joined Multiaddr
 func (m *Multiaddr) Encapsulate(o *Multiaddr) *Multiaddr {
 	b := make([]byte, len(m.Bytes)+len(o.Bytes))
 	b = append(m.Bytes, o.Bytes...)
 	return &Multiaddr{Bytes: b}
 }
 
+// Decapsulate unwraps Multiaddr up until the given Multiaddr is found.
 func (m *Multiaddr) Decapsulate(o *Multiaddr) (*Multiaddr, error) {
 	s1, err := m.String()
 	if err != nil {
@@ -68,9 +74,10 @@ func (m *Multiaddr) Decapsulate(o *Multiaddr) (*Multiaddr, error) {
 	return NewMultiaddr(s1[:i])
 }
 
+// DialArgs is a convenience function returning arguments for use in net.Dial
 func (m *Multiaddr) DialArgs() (string, string, error) {
 	if !m.IsThinWaist() {
-		return "", "", fmt.Errorf("%s is not a 'thin waist' address.", m)
+		return "", "", fmt.Errorf("%s is not a 'thin waist' address", m)
 	}
 
 	str, err := m.String()
@@ -84,6 +91,8 @@ func (m *Multiaddr) DialArgs() (string, string, error) {
 	return network, host, nil
 }
 
+// IsThinWaist returns whether this multiaddr includes "Thin Waist" Protocols.
+// This means: /{IP4, IP6}/{TCP, UDP}
 func (m *Multiaddr) IsThinWaist() bool {
 	p, err := m.Protocols()
 	if err != nil {

Godeps/_workspace/src/github.com/jbenet/go-multiaddr/multiaddr_test.go

@@ -14,7 +14,7 @@ func TestStringToBytes(t *testing.T) {
 			t.Error("failed to decode hex", h)
 		}
 
-		b2, err := StringToBytes(s)
+		b2, err := stringToBytes(s)
 		if err != nil {
 			t.Error("failed to convert", s)
 		}
@@ -35,7 +35,7 @@ func TestBytesToString(t *testing.T) {
 			t.Error("failed to decode hex", h)
 		}
 
-		s2, err := BytesToString(b)
+		s2, err := bytesToString(b)
 		if err != nil {
 			t.Error("failed to convert", b)
 		}

Godeps/_workspace/src/github.com/jbenet/go-multiaddr/protocols.go

@@ -1,5 +1,6 @@
 package multiaddr
 
+// Protocol is a Multiaddr protocol description structure.
 type Protocol struct {
 	Code int
 	Size int
@@ -10,7 +11,6 @@ type Protocol struct {
 // 1. avoid parsing the csv
 // 2. ensuring errors in the csv don't screw up code.
 // 3. changing a number has to happen in two places.
-
 const (
 	P_IP4  = 4
 	P_TCP  = 6
@@ -20,6 +20,7 @@ const (
 	P_SCTP = 132
 )
 
+// Protocols is the list of multiaddr protocols supported by this module.
 var Protocols = []*Protocol{
 	&Protocol{P_IP4, 32, "ip4"},
 	&Protocol{P_TCP, 16, "tcp"},
@@ -32,6 +33,7 @@ var Protocols = []*Protocol{
 	// {443, 0, "https"},
 }
 
+// ProtocolWithName returns the Protocol description with given string name.
 func ProtocolWithName(s string) *Protocol {
 	for _, p := range Protocols {
 		if p.Name == s {
@@ -41,6 +43,7 @@ func ProtocolWithName(s string) *Protocol {
 	return nil
 }
 
+// ProtocolWithCode returns the Protocol description with given protocol code.
 func ProtocolWithCode(c int) *Protocol {
 	for _, p := range Protocols {
 		if p.Code == c {