Wrapped the errors for Maria DB in the new `ConnectionError` object.

lib/dialects/mariadb/connection-manager.js

@@ -2,7 +2,8 @@
 var AbstractConnectionManager = require('../abstract/connection-manager')
   , ConnectionManager
   , Utils = require('../../utils')
-  , Promise = require('../../promise');
+  , Promise = require('../../promise')
+  , sequelizeErrors = require('../../errors');
 
 ConnectionManager = function(dialect, sequelize) {
   AbstractConnectionManager.call(this, dialect, sequelize);
@@ -44,7 +45,7 @@ ConnectionManager.prototype.connect = function(config) {
     var connection = new self.lib();
     connection.connect(connectionConfig);
     connection.on('error', function(err) {
-      return reject(err);
+      return reject(new sequelizeErrors.ConnectionError(err));
     });
     connection.on('connect', function() {
       return resolve(connection);