Move managers to the cache package

- Not entirely accurate name but not really worth to have a separate package for managers

src/test/java/fr/xephi/authme/command/CommandServiceTest.java

@@ -3,7 +3,7 @@ package fr.xephi.authme.command;
 import fr.xephi.authme.AuthMe;
 import fr.xephi.authme.command.help.HelpProvider;
 import fr.xephi.authme.datasource.DataSource;
-import fr.xephi.authme.manager.IpAddressManager;
+import fr.xephi.authme.cache.IpAddressManager;
 import fr.xephi.authme.output.MessageKey;
 import fr.xephi.authme.output.Messages;
 import fr.xephi.authme.permission.PermissionsManager;

src/test/java/fr/xephi/authme/manager/CaptchaManagerTest.java

@@ -1,5 +1,6 @@
 package fr.xephi.authme.manager;
 
+import fr.xephi.authme.cache.CaptchaManager;
 import fr.xephi.authme.settings.NewSetting;
 import fr.xephi.authme.settings.properties.SecuritySettings;
 import org.junit.Test;

src/test/java/fr/xephi/authme/manager/IpAddressManagerTest.java

@@ -1,5 +1,6 @@
 package fr.xephi.authme.manager;
 
+import fr.xephi.authme.cache.IpAddressManager;
 import fr.xephi.authme.settings.NewSetting;
 import fr.xephi.authme.settings.properties.HooksSettings;
 import org.bukkit.entity.Player;