fix(exch/bs/pb) rename proto package -> bitswap_message_pb

exchange/bitswap/message/internal/pb/message.pb.go

-// Code generated by protoc-gen-go.
+// Code generated by protoc-gen-gogo.
 // source: message.proto
 // DO NOT EDIT!
 
 /*
-Package bitswap is a generated protocol buffer package.
+Package bitswap_message_pb is a generated protocol buffer package.
 
 It is generated from these files:
 	message.proto
@@ -11,9 +11,9 @@ It is generated from these files:
 It has these top-level messages:
 	PBMessage
 */
-package pb
+package bitswap_message_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.

exchange/bitswap/message/internal/pb/message.proto

-package pb;
+package bitswap.message.pb;
 
 message PBMessage {
 	repeated string wantlist = 1;