adding testcase showing the problem with not probing the real content-dimensions
including the fix to get around it.
marc-portier's change to fix the scrolling width resizing issue was incomplete -- it didn't correctly catch subsequent changes in size. My change removes the previousContentWidth variable because the contentWidth variable contains the previous content width on a re-initialization. It is the right comparison to make against the new probed width.
Fix calculation of pane width

jQuery `innerWidth` includes element padding, so adding padding to innerWidth value gives incorrect pane width.
jQuery `width` does not include element padding, so no need to substract padding width from `width`.
Merge remote-tracking branch 'remotes/good-request-marc-portier/master'
Little fix for previously merged commit.
Merge remote-tracking branch 'remotes/good-request-zhihaojia/width-calc'
More fixes for calculation of pane width.
Another bugfix for flexible designs until the plugin's author didn't upgrade it based on several pull requests.
Update minified version.