PHP7, SSL support and others

【Contents of revision】
■Support for PHP7
■Support for SSL
■Fixed an error that sometimes appears in the theme options screen.

The following files have been modified for this update.
【Fixed files】
admin/theme-options.php
widget/ad.php
widget/google_search.php
widget/news_list.php
widget/ranking_post_list.php
widget/recent.php
widget/styled_post_list1.php
widget/styled_post_list2.php
style.css

For more details, please visit the download site for purchasers of Reviewer (tcd026).