Rukkit 0.8.2-dev update

• Added i18n support.(LangUtil)
• Fixed a plugin bug.
• Fixed a no-stop mode bug: when singlePlayerMode=false, server will crash.
• Improved no-stop vote: when a player joined a no-stop game,server will inform it if a vote is running.
• Improved plugin life cycle.

Full Changelog: v0.8.0...v0.8.2-dev