For those of you who use maven, you may use this in your pom.xml right next to your bukkit info:

<repository>
    <id>chester</id>
    <url>http://ci.hawkfalcon.com/plugin/repository/everything/</url>
</repository>

<dependency>
    <groupId>info.gomeow</groupId>
    <artifactId>chester</artifactId>
    <version>2.3.0</version>
</dependency>

Chester has two events. Hook into these events the same way you would with a bukkit event

This event is called whenever someone speaks a triggerword.

• getPlayer() returns the player who spoke the message to be logged
• getMessage() returns the message to be logged
• setMessage() will set the new message to be logged
• setCancelled() will set the cancellation state
• isCancelled() will return whether or not the event is cancelled

This event is called whenever chester is about to broadcast a message

• getRecipients() returns a set of the players to be broadcasted to. You can modify this list to change who hears the message
• getMessage() returns the message to be broadcasted
• setMessage() will set the new message to be broadcasted