Implemented getemail command

Various other improvements.

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

@@ -164,6 +164,21 @@ public class CommandManager {
         accountsCommand.setCommandPermissions("authme.admin.accounts", CommandPermissions.DefaultPermission.OP_ONLY);
         accountsCommand.addArgument(new CommandArgumentDescription("player", "Player name or IP", true));
 
+        // Register the getemail command
+        CommandDescription getEmailCommand = new CommandDescription(
+                new RegisterCommand(),
+                new ArrayList<String>() {{
+                    add("getemail");
+                    add("getmail");
+                    add("email");
+                    add("mail");
+                }},
+                "Display player's email",
+                "Display the email address of the specified player if set.",
+                authMeCommand);
+        getEmailCommand.setCommandPermissions("authme.admin.getemail", CommandPermissions.DefaultPermission.OP_ONLY);
+        getEmailCommand.addArgument(new CommandArgumentDescription("player", "Player name", true));
+
         // Register the purge command
         CommandDescription purgeCommand = new CommandDescription(
                 new PurgeCommand(),

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

@@ -25,6 +25,7 @@ public class AccountsCommand extends ExecutableCommand {
     public boolean executeCommand(final CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
         // AuthMe plugin instance
         final AuthMe plugin = AuthMe.getInstance();
+
         // Messages instance
         final Messages m = Messages.getInstance();
 

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

@@ -0,0 +1,45 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.cache.auth.PlayerAuth;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.settings.Messages;
+import org.bukkit.command.CommandSender;
+
+public class GetEmailCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        AuthMe plugin = AuthMe.getInstance();
+
+        // Messages instance
+        Messages m = Messages.getInstance();
+
+        // Get the player name
+        String playerName = sender.getName();
+        if(commandArguments.getCount() >= 1)
+            playerName = commandArguments.get(0);
+
+        // Get the authenticated user
+        PlayerAuth auth = plugin.database.getAuth(playerName.toLowerCase());
+        if (auth == null) {
+            m.send(sender, "unknown_user");
+            return true;
+        }
+
+        // Show the email address
+        sender.sendMessage("[AuthMe] " + playerName + "'s email: " + auth.getEmail());
+        return true;
+    }
+}

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

@@ -24,6 +24,7 @@ public class LastLoginCommand extends ExecutableCommand {
     public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
         // AuthMe plugin instance
         AuthMe plugin = AuthMe.getInstance();
+
         // Messages instance
         Messages m = Messages.getInstance();
 

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

@@ -28,6 +28,7 @@ public class RegisterCommand extends ExecutableCommand {
     public boolean executeCommand(final CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
         // AuthMe plugin instance
         final AuthMe plugin = AuthMe.getInstance();
+
         // Messages instance
         final Messages m = Messages.getInstance();
 

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

@@ -29,6 +29,7 @@ public class ReloadCommand extends ExecutableCommand {
 
         // AuthMe plugin instance
         AuthMe plugin = AuthMe.getInstance();
+
         // Messages instance
         Messages m = Messages.getInstance();