Sonar quality bugfix and minor refactor

Sonar bug fixes using Yoda condition in equals expression when comparing String literal with String object.
Using try-with-resources if we use Scanner to close the underlying stream is a good practice to handle resources.
Minimal refactor.

Sonar bug fixes using Yoda condition in equals expression when comparing String literal with String object.
Using try-with-resources if we use Scanner to close the underlying stream is a good practice to handle resources.
Minimal refactor.

Module pattern #62

Issue #450. First commit. Queue Based Load Leveling

Add hexagonal architecture presentation

Object Mother pattern #498

Added dependency "maven-pmd-plugin" to the pom file.

#502 Added logging framework to repository

Update App.java

The relationship between decorator and target (in the code example between Troll und SmartTroll) ist not a composition as described in the code comment lines of class App. It's a aggregation. In a composition both instances canncot live without the other one. But the target (Troll) could live without the decorator (Smart Troll). Changed "composition" to "aggregation" in the comment lines. Code lines are unchanged.
Greetings Thomas

* 'master' of https://github.com/iluwatar/java-design-patterns: (27 commits)
  Remove use of coveralls-maven-plugin (sonarqube.com covers this)
  Add SonarQube.com badge
  Fix environment variable
  Add Travis instructions for SonarQube.com analysis
  Adds more criticism to Singleton pattern.
  Event Based Asynchronous pattern: Add missing license header and puml diagram
  Changed config to non-interactive
  Moved config into a separate dir
  Unused import removed.
  End process logic clause has been corrected.
  Caching pattern: Documentation and diagram
  Fixes #437. Adds criticism to Singleton pattern.
  Alter JUnit tests to run in lesser time.
  Updated version snapshot to 1.14.0
  Changes based on review feedback.
  Closes #436. Adds criticism to service locator pattern.
  Caching pattern: Implementation of Cache-Aside pattern
  Caching pattern: Style fix for null check
  Caching pattern: Refactor LRU cache to avoid NPE and unnecessary cache lookup
  Caching pattern: Refactor shutdown hook to use method reference
  ...