Revert to bump findbugs and checkstyle plugin version.
Revert to bump findbugs and checkstyle plugin version.

We will refactoring later for these plugin's report.

cocoatomo/asakusafw,akirakw/asakusafw,ashigeru/asakusafw,asakusafw/asakusafw,akirakw/asakusafw,asakusafw/asakusafw,ashigeru/asakusafw,cocoatomo/asakusafw