Add Bukkit, API CraftBukkit API, SkillAPI, ControllablesAPI to eclipse external jars
SkillAPI http://dev.bukkit.org/bukkit-plugins/skillapi/#c65
ControllableMobsAPI http://dev.bukkit.org/bukkit-plugins/controllable-mobs-api/
CraftBukkit http://dl.bukkit.org/downloads/craftbukkit/
Bukkit http://dl.bukkit.org/downloads/bukkit/
export as jar file.