Merge pull request #9 from ztbrown/patch-1

Change 'element' to 'selector' in intro.md

docs/intro.md

@@ -141,7 +141,7 @@ to disable.  Each button in the array is an object of the format:
   - `events`: A hash of events to bind onto the button, for example `{'mouseover': function(){}}`.  Adding a click event to `events` when you
   already have an `action` specified is not supported.
 - `advanceOn`: An action on the page which should advance shepherd to the next step.  It can be of the form `"selector event"`, or an object with those
-properies.  For example: `".some-element click"`, or `{element: '.some-element', event: 'click'}`.  It doesn't have to be an event inside
+properies.  For example: `".some-element click"`, or `{selector: '.some-element', event: 'click'}`.  It doesn't have to be an event inside
 the tour, it can be any event fired on any element on the page.  You can also always manually advance the Tour by calling `myTour.next()`.
 - `showCancelLink`: Should a cancel "✕" be shown in the header of the step?
 - `scrollTo`: Should the element be scrolled to when this step is shown?