added support for Rails 4.1.4 w/Turbolinks

Please merge this for Rails 4 support.  Currently, for those using Rails w/Turbolinks, the page must be refreshed before Colorbox will work.  This has to do with the 'page:change' event.

Again, credit to sydneyitguy/colorbox@11cb088358429c4fb80ced7da0c6b49f7285a084 for the solution.