Add ClientConfiguration#UTF8_CHARSET
Remove old findbugs configuration
Add LibnotifyMessageNotifier (with java-gnome)

** "tirasi no ura"
java-gnome seems to be able to be linked with not-GPL sources. So I can
  select java-gnome.
But on Gentoo Linux (with gnome 3.6) Notification.addAction don't run
  properly. (This problem occurs on libnotify-jni-bind (branch), too.)

LibnotifyMessageNotifier may not run on intellij, or
  elnetw-launcher/target/elnetw-dist.jar, but only in distributed package.
This is because "JavaLauncher's ClassLoader" have prior to
  "ApplicationClassLoader". I tried to fix this problem, but many
  problems had occured so I give up.
On IntelliJ, you can run with java-gnome properly if you can set
  classpath completely.

I'll do work on ciphering-consumer-key as early as possible..