Add option to Modal to force refresh the content.

Add option to Modal to force refresh the content. This option is useful for modals that show remote content that may change, and for using the same modal div for different modals. For example, the following HTML will work as expected:

    <a href="/api/pages/user/profile" data-toggle="modal" data-target="#myModal" data-refresh="true">My Profile</a>
    <a href="/api/pages/user/settings" data-toggle="modal" data-target="#myModal" data-refresh="true">Account Settings</a>

This feature has only been tested in Chrome Version 24.0.1312.57.