* Set explicit plugin versions to remove warnings in maven 3.x
* Ignore IntelliJ project files in git
* Use random port to start MockFluentd server. This change fixes 'port already in use' error when running tests.
#7 Print stackTrace within the logger instead of using e.printStackTrace(). Suppress stack trace when running TestRawSocketSender.
Merge pull request #8 from xerial/feature/random-port

Use a random port available in the system when running `mvn test`.