Adjust checkstyle rules. Make checkstyle fail the build when violations are found. Correct all current checkstyle violations.

poison-pill/src/main/java/com/iluwatar/poison/pill/MqSubscribePoint.java

@@ -0,0 +1,9 @@
+package com.iluwatar.poison.pill;
+
+/**
+ * Endpoint to retrieve {@link Message} from queue
+ */
+public interface MqSubscribePoint {
+
+  public Message take() throws InterruptedException;
+}