Added option for modal-like popups

This adds three new options to enable modal-like behavior:

* showCloseBtn: Disables displaying the close button.
* enableEscapeKey: Disables dismissing popups by using the keyboard.
* modal: Enables modal behavior for a popup, so it's not dismissable by
    usual means. This is a synonym for setting closeOnContentClick,
    closeOnBgClick, showCloseBtn, and enableEscapeKey to false.
Revert "added shadows for inline and ajax types"

This reverts commit c3602c1fbc8e3505ce21107abcb1ed1a9a845e89.
Fix: hasScrollBar returns incorrect value if body has height applied
gitignore upd
docs upd, closes #96
Fixed #104: body styles are kept after popup is closed
Fixed #103:  jQuery 1.8.3 and inline element type that is created dynamically causes exception
Added an AfterClose event

Allows for extra programatic control over the way the popup behaves.
Merge pull request #105 from julen/feature/after_close_event

Added an AfterClose event
Fix #100: alignment of close icon with iframe
 Added ajaxContentAdded event that fires after content is added to DOM. + fixed issue that could prevent modifying of responseText
docs upd
AJAX "responseText" is deprecated, use "data" instead.
Fixes #84: popup incorrectly positioned with position:relative on body
0.8.9 - see changelog for details
Fix typo in website code comment
Merge pull request #114 from johnbacon/patch-1

Fix typo in website code comment
added beforeClose event
ImageLoadComplete event
Remove jQuery event alias calls

We use a custom jQuery build withouth the event-alias module so functions "click" or "focus" are not working and calls to the underlying methods "on" and "trigger" should be used. Works like a charm now! :)