add selector option to alerts, update modal settings strategy

js/bootstrap-modal.js

@@ -53,12 +53,10 @@
   * ============================= */
 
   var Modal = function ( content, options ) {
-    this.settings = $.extend({}, $.fn.modal.defaults)
+    this.settings = $.extend({}, $.fn.modal.defaults, options)
     this.$element = $(content)
       .delegate('.close', 'click.modal', $.proxy(this.hide, this))
 
-    $.extend( this.settings, options )
-
     if ( this.settings.show ) {
       this.show()
     }