JQuery: Add support for outerWidth and outerHeight used as setters

As described in the following blog post, outerWidth and outerHeight can
now be used to set the size of elements.

http://blog.jquery.com/2012/08/16/jquery-1-8-box-sizing-width-csswidth-and-outerwidth/
Added string overloads as well as support for innerWidth and innerHeight.
Merge pull request #1737 from malaporte/master

JQuery: Add support for outerWidth and outerHeight used as setters - thanks chap!