Add more checkstyle tests

- Lines containing tab(s) after space
- Usage of printStackTrace
- Usage of println
- Add SupressionCommentFilter module

SuppressionCommentFilter can be enabled with
// CHECKSTYLE:OFF
and disabled with
// CHECKSTYLE:ON

smack-android/src/main/java/org/jivesoftware/smackx/debugger/android/AndroidDebugger.java

@@ -45,4 +45,9 @@ public class AndroidDebugger extends AbstractDebugger {
     protected void log(String logMessage) {
                 Log.d("SMACK", logMessage);
     }
+
+    @Override
+    protected void log(String logMessage, Throwable throwable) {
+                Log.d("SMACK", logMessage, throwable);
+    }
 }