Plugin website added

Issue-21 (https://github.com/zielu/IntelliJadPlus/issues/21)
Issue-21 (https://github.com/zielu/IntelliJadPlus/issues/21)
Issue-26 (https://github.com/zielu/IntelliJadPlus/issues/26)
Issue-25 (https://github.com/zielu/IntelliJadPlus/issues/25)
Issue-22 (https://github.com/zielu/IntelliJadPlus/issues/22)
Updated release info for 0.5.5