Added getVerified method to DataSource.java

src/main/java/fr/xephi/authme/datasource/DataSource.java

@@ -228,6 +228,14 @@ public interface DataSource extends Reloadable {
      */
     DataSourceValue<String> getEmail(String user);
 
+    /**
+     * Checks whether the user's email is verified.
+     *
+     * @param user the user whose email verification status is being checked
+     * @return true if the user's email is verified, false if not, or null if the user does not exist
+     */
+    DataSourceValue<Boolean> getVerified(String user);
+
     /**
      * Return all players of the database.
      *