Patch to fix theme folder name detection

Here is a patch against 1.0.2 to fix the regular expression which was not properly detecting the theme folder name in some zip files. Zip files which did not include a bare parent folder entry were not being detected correctly.

https://gist.github.com/benallfree/8069845

http://ww.wp.xz.cn/plugins/easy-theme-and-plugin-upgrades/