Issue #65: Add "Broadcast Message" feature to API

[gg]

Overview

To broadcast a message, the server sends a PacketPokerMessage packet to the client. The client then displays the message in a jpoker.dialog() window.

API resources that were added

Broadcast a message to players

POST /broadcast

Parameters:

• message - string required

  Example request body:

{"message": "Hello, players"}

Broadcast a message to a specific player

POST /broadcast/player/:serial

Parameters

• message - string required

  Example request body:

{"message": "Hello, player"}

Other notable changes:

• Modify apiclient to allow for POST requests by specifying a request body

[gg]

changing commit comment, then re-requesting pull request