* Fix issue #761: ThreadSafeDoubleCheckLocking.java: Instantiating by Reflection call will be successful if you do that firstly
* Create leader election module
* Create Interface of Instance and MessageManager
* Create implementations with token ring algorithm
* Change package structure.
Create basic message system.
* Implement heartbeat and heartbeat invoking message system
* Implement election message handler
* Add leader message handler
* Add main entry point
* Add comments
* Update README.md
* Fix checkstyle issue
* Add Unit Tests
* Add Unit Tests
* Add bully leader selection
* Change System.out to log print.
Add MIT license in each file.
* Add More java doc comments
* Add unit test
* Add unit tests
* Add subclass-sandbox
* Add Unit Test
* Add Unit Test
* Fix Typo
* Move dependency into parent pom.xml
* Change local valuable reference to be var
