Merge btcjson repo into btcjson directory.

btcjson/CONTRIBUTORS

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+# This is the list of people who have contributed code to the repository.
+#
+# Names should be added to this file only after verifying that the individual
+# or the individual's organization has agreed to the LICENSE.
+#
+# Names should be added to this file like so:
+# Name <email address>
+
+John C. Vernaleo <jcv@conformal.com>
+Dave Collins <davec@conformal.com>
+Owain G. Ainsworth <oga@conformal.com>
+David Hill <dhill@conformal.com>
+Josh Rickmar <jrick@conformal.com>
+Andreas Metsälä <andreas.metsala@gmail.com>
+Francis Lam <flam@alum.mit.edu>
+Geert-Johan Riemer <geertjohan.riemer@gmail.com>

btcjson/README.md

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+btcjson
+=======
+
+[![Build Status](https://travis-ci.org/btcsuite/btcd.png?branch=master)]
+(https://travis-ci.org/btcsuite/btcd) [![ISC License]
+(http://img.shields.io/badge/license-ISC-blue.svg)](http://copyfree.org)
+
+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.
+
+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.
+
+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
+package.  Instead, RPC clients should use the
+[btcrpcclient](https://github.com/btcsuite/btcrpcclient) package which provides
+a full blown RPC client with many features such as automatic connection
+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)]
+(http://godoc.org/github.com/btcsuite/btcd/btcjson)
+
+Full `go doc` style documentation for the project can be viewed online without
+installing this package by using the GoDoc site
+[here](http://godoc.org/github.com/btcsuite/btcd/btcjson).
+
+You can also view the documentation locally once the package is installed with
+the `godoc` tool by running `godoc -http=":6060"` and pointing your browser to
+http://localhost:6060/pkg/github.com/btcsuite/btcd/btcjson
+
+## Installation
+
+```bash
+$ go get github.com/btcsuite/btcd/btcjson
+```
+
+## GPG Verification Key
+
+All official release tags are signed by Conformal so users can ensure the code
+has not been tampered with and is coming from Conformal.  To verify the
+signature perform the following:
+
+- Download the public key from the Conformal website at
+  https://opensource.conformal.com/GIT-GPG-KEY-conformal.txt
+
+- Import the public key into your GPG keyring:
+  ```bash
+  gpg --import GIT-GPG-KEY-conformal.txt
+  ```
+
+- Verify the release tag with the following command where `TAG_NAME` is a
+  placeholder for the specific tag:
+  ```bash
+  git tag -v TAG_NAME
+  ```
+
+## License
+
+Package btcjson is licensed under the [copyfree](http://copyfree.org) ISC
+License.