fix(crypto) rename proto package -> crypto_pb, regen go file

+ add Makefile

crypto/internal/pb/Makefile

+PB = $(wildcard *.proto)
+GO = $(PB:.proto=.pb.go)
+
+all: $(GO)
+
+%.pb.go: %.proto
+		protoc --gogo_out=. --proto_path=../../../../../../:/usr/local/opt/protobuf/include:. $<
+
+clean:
+		rm *.pb.go

crypto/internal/pb/encode.pb.go → crypto/internal/pb/crypto.pb.go

-// Code generated by protoc-gen-go.
-// source: encode.proto
+// Code generated by protoc-gen-gogo.
+// source: crypto.proto
 // DO NOT EDIT!
 
 /*
-Package crypto is a generated protocol buffer package.
+Package crypto_pb is a generated protocol buffer package.
 
 It is generated from these files:
-	encode.proto
+	crypto.proto
 
 It has these top-level messages:
 	PBPublicKey
 	PBPrivateKey
 */
-package crypto
+package crypto_pb
 
-import proto "github.com/jbenet/go-ipfs/Godeps/_workspace/src/code.google.com/p/goprotobuf/proto"
+import proto "github.com/jbenet/go-ipfs/Godeps/_workspace/src/code.google.com/p/gogoprotobuf/proto"
 import math "math"
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -52,7 +52,7 @@ func (x *KeyType) UnmarshalJSON(data []byte) error {
 }
 
 type PBPublicKey struct {
-	Type             *KeyType `protobuf:"varint,1,req,enum=crypto.KeyType" json:"Type,omitempty"`
+	Type             *KeyType `protobuf:"varint,1,req,enum=crypto.pb.KeyType" json:"Type,omitempty"`
 	Data             []byte   `protobuf:"bytes,2,req" json:"Data,omitempty"`
 	XXX_unrecognized []byte   `json:"-"`
 }
@@ -76,7 +76,7 @@ func (m *PBPublicKey) GetData() []byte {
 }
 
 type PBPrivateKey struct {
-	Type             *KeyType `protobuf:"varint,1,req,enum=crypto.KeyType" json:"Type,omitempty"`
+	Type             *KeyType `protobuf:"varint,1,req,enum=crypto.pb.KeyType" json:"Type,omitempty"`
 	Data             []byte   `protobuf:"bytes,2,req" json:"Data,omitempty"`
 	XXX_unrecognized []byte   `json:"-"`
 }
@@ -100,5 +100,5 @@ func (m *PBPrivateKey) GetData() []byte {
 }
 
 func init() {
-	proto.RegisterEnum("crypto.KeyType", KeyType_name, KeyType_value)
+	proto.RegisterEnum("crypto.pb.KeyType", KeyType_name, KeyType_value)
 }

crypto/internal/pb/encode.proto → crypto/internal/pb/crypto.proto

-package crypto;
+package crypto.pb;
 
 enum KeyType {
 	RSA = 0;