Questions about setting up my development environment for phergie

Should I composer install from the composer.json file on the readme?

If so, where do I put my plugin? If I try to include it in the composer.json file, nothing is being installed.

{
    "require": {
        "phergie/phergie-irc-bot-react": "^1.3",
        "phergie/phergie-irc-plugin-react-tableflip": "^1.0"
    }
}

This is what is actually installed:

evenement/evenement              v2.0.0 Événement is a very simple event dispatching library for PHP
monolog/monolog                  1.17.1 Sends your logs to files, sockets, inboxes, databases and various web services
phergie/phergie-irc-client-react 2.3.0  IRC client library built on React
phergie/phergie-irc-connection   2.0.0  Data structure for containing information about an IRC client connection
phergie/phergie-irc-event        1.0.2  PHP data structure for IRC event information
phergie/phergie-irc-generator    1.7.0  Generator for messages conforming to the IRC protocol
phergie/phergie-irc-parser       2.1.0  Parser for messages conforming to the IRC protocol
psr/log                          1.0.0  Common interface for logging libraries
react/cache                      v0.4.0 Async caching.
react/dns                        v0.4.1 Async DNS resolver.
react/event-loop                 v0.4.1 Event loop abstraction layer that libraries can use for evented I/O.
react/promise                    v2.2.1 A lightweight implementation of CommonJS Promises/A for PHP
react/socket                     v0.4.2 Library for building an evented socket server.
react/socket-client              v0.4.4 Async connector to open TCP/IP and SSL/TLS based connections.
react/stream                     v0.4.3 Basic readable and writable stream interfaces that support piping.

So where does my plugin code belong? Where is the ./vendor/bin directory that I need in order to run phergie locally and configure it.