Update CreeperAttackStrategy.java

Update for 1.5.2
Update SentryInstance.java

Update for 1.5.2
Update SpiderAttackStrategy.java

Update for 1.5.2
Update Util.java

Update for 1.5.2
Update plugin.yml

Add more info for your plugin.yml and clear a bit the plugin.yml
Merge pull request #112 from XxCoolGamesxX/master

Update for the 1.5.2 of Bukkit and update a bit the plugin.yml.