btcjson: Replace btcjson with version 2.

This commit removes the old and deprecated btcjsonv1 package, moves the
new version 2 package into its place, and updates all imports accordingly.

btcjson/README.md

@@ -7,12 +7,11 @@ btcjson
 
 Package btcjson implements concrete types for marshalling to and from the
 bitcoin JSON-RPC API.  A comprehensive suite of tests is provided to ensure
-proper functionality.  Package btcjson is licensed under the copyfree ISC
-license.
+proper functionality.
 
-Although this package was primarily written for btcd, it has intentionally been
-designed so it can be used as a standalone package for any projects needing to
-marshal to and from bitcoin JSON-RPC requests and responses.
+Although this package was primarily written for the btcsuite, it has
+intentionally been designed so it can be used as a standalone package for any
+projects needing to marshal to and from bitcoin JSON-RPC requests and responses.
 
 Note that although it's possible to use this package directly to implement an
 RPC client, it is not recommended since it is only intended as an infrastructure
@@ -23,42 +22,6 @@ management, websocket support, automatic notification re-registration on
 reconnect, and conversion from the raw underlying RPC types (strings, floats,
 ints, etc) to higher-level types with many nice and useful properties.
 
-## JSON RPC
-
-Bitcoin provides an extensive API call list to control the chain and wallet
-servers through JSON-RPC.  These can be used to get information from the server
-or to cause the server to perform some action.
-
-The general form of the commands are:
-
-```JSON
-	{"jsonrpc": "1.0", "id":"test", "method": "getinfo", "params": []}
-```
-
-btcjson provides code to easily create these commands from go (as some of the
-commands can be fairly complex), to send the commands to a running bitcoin RPC
-server, and to handle the replies (putting them in useful Go data structures).
-
-## Sample Use
-
-```Go
-	// Create a new command.
-	cmd, err := btcjson.NewGetBlockCountCmd()
-	if err != nil {
-		// Handle error
-	}
-
-	// Marshal the command to a JSON-RPC formatted byte slice.
-	marshalled, err := btcjson.MarshalCmd(id, cmd)
-	if err != nil {
-		// Handle error
-	}
-
-	// At this point marshalled contains the raw bytes that are ready to send
-	// to the RPC server to issue the command.
-	fmt.Printf("%s\n", marshalled)
-```
-
 ## Documentation
 
 [![GoDoc](https://img.shields.io/badge/godoc-reference-blue.svg)]
@@ -78,6 +41,26 @@ http://localhost:6060/pkg/github.com/btcsuite/btcd/btcjson
 $ go get github.com/btcsuite/btcd/btcjson
 ```
 
+## Examples
+
+* [Marshal Command]
+  (http://godoc.org/github.com/btcsuite/btcd/btcjson#example-MarshalCmd)  
+  Demonstrates how to create and marshal a command into a JSON-RPC request.
+
+* [Unmarshal Command]
+  (http://godoc.org/github.com/btcsuite/btcd/btcjson#example-UnmarshalCmd)  
+  Demonstrates how to unmarshal a JSON-RPC request and then unmarshal the
+  concrete request into a concrete command.
+
+* [Marshal Response]
+  (http://godoc.org/github.com/btcsuite/btcd/btcjson#example-MarshalResponse)  
+  Demonstrates how to marshal a JSON-RPC response.
+
+* [Unmarshal Response]
+  (http://godoc.org/github.com/btcsuite/btcd/btcjson#example-package--UnmarshalResponse)  
+  Demonstrates how to unmarshal a JSON-RPC response and then unmarshal the
+  result field in the response to a concrete type.
+
 ## GPG Verification Key
 
 All official release tags are signed by Conformal so users can ensure the code

btcjson/v2/btcjson/btcdextcmds_test.go → btcjson/btcdextcmds_test.go

@@ -11,7 +11,7 @@ import (
 	"reflect"
 	"testing"
 
-	"github.com/btcsuite/btcd/btcjson/v2/btcjson"
+	"github.com/btcsuite/btcd/btcjson"
 )
 
 // TestBtcdExtCmds tests all of the btcd extended commands marshal and unmarshal

btcjson/v2/btcjson/btcwalletextcmds_test.go → btcjson/btcwalletextcmds_test.go

@@ -11,7 +11,7 @@ import (
 	"reflect"
 	"testing"
 
-	"github.com/btcsuite/btcd/btcjson/v2/btcjson"
+	"github.com/btcsuite/btcd/btcjson"
 )
 
 // TestBtcWalletExtCmds tests all of the btcwallet extended commands marshal and