Support maven-findbugs-plugin
Support maven-findbugs-plugin

FindBugs is a static analyser to look for bugs in Java code.
This change enable mspgack-java to analyse potential bugs by
using FindBugs.

To use findbugs, please type

    $ mvn findbugs:findbugs

Signed-off-by: Tsuyoshi Ozawa <5f6624a79fc6be19242b6f85a4f5e0138f858769@gmail.com>

mikolak-net/msgpack-java,xuwei-k/msgpack-java,msgpack/msgpack-java,xerial/msgpack-java,suzukaze/msgpack-java,jackyglony/msgpack-java,dongjiaqiang/msgpack-java,mikolak-net/msgpack-java,xuwei-k/msgpack-java,suzukaze/msgpack-java,xerial/msgpack-java,msgpack/msgpack-java,dongjiaqiang/msgpack-java,DataDog/msgpack-java,jackyglony/msgpack-java,DataDog/msgpack-java