Update jquery.autosize.js

on IE8 when textarea has display:none causes error:  Invalid argument. 
jquery.autosize.js, line 116 character 6

the width() returned by jQuery is a negative number, assigning it in IE8
causes the error.
Merge pull request #50 from Leonidaz/master

IE8 error Invalid argument when textarea has display:none 
Adding to plugins.jquery.com
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Fixed minor min-height issue with border-box sizing.