improved performance of dismiss button, especially on iPad
* Modal panel can now be top, centered or bottom
* The following new properties can now be set in the code: animationOutDuration, useParentWidth, statusBarHeight.
* Changed category to separate transition style and transition direction.
* Modal view can now slide in from top, left, bottom or right; and slide off in those directions also.
* Modal view can now have different styles for in and out i.e. fade in, slide out.
* Resizing the view can now accept a custom duration for the resize.