Renamed Heartbeat to HeartBeat.

Added HeartBeatDecoder.
Added HeartBeatEncoder.
BinaryMessageDecoder now uses HeartBeatDecoder.
MockOutput now logs a warning if a heartBeat cannot be encoded.
Added HeartBeatDecoderTest.
issue #35 #36
#story[1095]

racevisionGame/src/main/java/network/MessageDecoders/HeartBeatDecoder.java

@@ -0,0 +1,53 @@
+package network.MessageDecoders;
+
+import network.Messages.Enums.BoatActionEnum;
+import network.Messages.HeartBeat;
+
+import static network.Utils.ByteConverter.bytesToLong;
+
+/**
+ * Decodes {@link network.Messages.HeartBeat} messages.
+ */
+public class HeartBeatDecoder {
+
+    /**
+     * The encoded message.
+     */
+    private byte[] encodedMessage;
+
+    /**
+     * The decoded message.
+     */
+    private HeartBeat message;
+
+
+
+    /**
+     * Constructs a decoder to decode a given message.
+     * @param encodedMessage The message to decode.
+     */
+    public HeartBeatDecoder(byte[] encodedMessage) {
+        this.encodedMessage = encodedMessage;
+
+        decode();
+    }
+
+
+    /**
+     * Decodes the contained message.
+     */
+    private void decode() {
+
+        message = new HeartBeat(bytesToLong(encodedMessage));
+    }
+
+
+    /**
+     * Returns the decoded message.
+     * @return The decoded message.
+     */
+    public HeartBeat getMessage() {
+        return message;
+    }
+
+}