Fix blocker z-index issue

[okuyan]

To avoid modal going behind the blocker. related to #70
Same fix as https://github.com/dei79/jquery-modal-rails/pull/14/files in any element type of designated modal content.

[kylefox]

I think I understand what this does.

Instead of having to do $(html).appendTo('body').modal(); you can simply do $(html).modal(); — is that the intention of this patch?

Thanks!

[okuyan]

I had a similar z-index issue to #70 which modal content goes behind the overlay. It only happens in Android default browser, but not in regular browsers. So, I can't provide the code how the issue happens. I thought the patch d11b6790b0c4e2cd50364bc22b3304f4493355bc is good to make sure the main contents css will never affect to modal content itself. So I wanted to do the same thing when el is not "a". This resolved my issue.

Thanks!

[sjamaan]

Please consider merging this; I had the same problem with the whole page including the modal itself being grayed out, and okuyan's branch fixed it.

[kylefox]

Done, thanks for the fix.