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

observer/src/main/java/com/iluwatar/observer/Weather.java

@@ -27,6 +27,9 @@ public class Weather {
     observers.remove(obs);
   }
 
+  /**
+   * Makes time pass for weather
+   */
   public void timePasses() {
     WeatherType[] enumValues = WeatherType.values();
     currentWeather = enumValues[(currentWeather.ordinal() + 1) % enumValues.length];

observer/src/main/java/com/iluwatar/observer/generic/GWeather.java

@@ -15,6 +15,9 @@ public class GWeather extends Observable<GWeather, Race, WeatherType> {
     currentWeather = WeatherType.SUNNY;
   }
 
+  /**
+   * Makes time pass for weather
+   */
   public void timePasses() {
     WeatherType[] enumValues = WeatherType.values();
     currentWeather = enumValues[(currentWeather.ordinal() + 1) % enumValues.length];

observer/src/main/java/com/iluwatar/observer/generic/Observable.java

@@ -22,6 +22,9 @@ public abstract class Observable<S extends Observable<S, O, A>, O extends Observ
     this.observers.add(observer);
   }
 
+  /**
+   * Notify observers
+   */
   @SuppressWarnings("unchecked")
   public void notifyObservers(A argument) {
     for (O observer : observers) {

observer/src/main/java/com/iluwatar/observer/generic/Observer.java

@@ -3,10 +3,6 @@ package com.iluwatar.observer.generic;
 /**
  * 
  * Observer
- *
- * @param <S>
- * @param <O>
- * @param <A>
  */
 public interface Observer<S extends Observable<S, O, A>, O extends Observer<S, O, A>, A> {