better option usage

lib/sequelize.js

@@ -5,20 +5,18 @@ var Utils        = require("./utils")
 
 module.exports = (function() {
   var Sequelize = function(database, username, password, options) {
-    options = options || {}
-
-    Utils._.reject(options, function(_, key) {
-      return ["host", "port", "disableTableNameModification"].indexOf(key) > -1
-    })
+    this.options = Utils._.extend({
+      connector: 'mysql',
+      host: 'localhost',
+      port: 3306,
+    }, options || {})
 
-    this.options = options
-    this.options.connector = this.options.connector || 'mysql'
     this.config = {
       database: database,
       username: username,
       password: (( (["", null, false].indexOf(password) > -1) || (typeof password == 'undefined')) ? null : password),
-      host    : options.host || 'localhost',
-      port    : options.port || 3306
+      host    : this.options.host,
+      port    : this.options.port
     }
 
     var ConnectorManager = require("./connectors/" + this.options.connector + "/connector-manager")