Minor fixes + code householding

- Fix SpawnCommandTest testing FirstSpawnCommand
- Fix javadoc errors
- Map TODO's to issue numbers where applicable
- Fix trivial TODO's

src/main/java/fr/xephi/authme/command/CommandService.java

@@ -46,6 +46,8 @@ public class CommandService {
      * @param permissionsManager The permissions manager
      * @param settings The settings manager
      * @param ipAddressManager The IP address manager
+     * @param pluginHooks The plugin hooks instance
+     * @param spawnLoader The spawn loader
      */
     public CommandService(AuthMe authMe, CommandMapper commandMapper, HelpProvider helpProvider, Messages messages,
                           PasswordSecurity passwordSecurity, PermissionsManager permissionsManager, NewSetting settings,

src/main/java/fr/xephi/authme/command/executable/authme/ChangePasswordAdminCommand.java

@@ -40,7 +40,7 @@ public class ChangePasswordAdminCommand implements ExecutableCommand {
             commandService.send(sender, MessageKey.INVALID_PASSWORD_LENGTH);
             return;
         }
-        // TODO ljacqu 20160312: The UNSAFE_PASSWORDS should be all lowercase
+        // TODO #602 20160312: The UNSAFE_PASSWORDS should be all lowercase
         // -> introduce a lowercase String list property type
         if (commandService.getProperty(SecuritySettings.UNSAFE_PASSWORDS).contains(playerPassLowerCase)) {
             commandService.send(sender, MessageKey.PASSWORD_UNSAFE_ERROR);