Fixed bugs / Added functions

【Fixed contents】
■SSL support
 Fixed a bug that the official Twitter button on the article page did not work properly under SSL environment.
■Added custom script function.

The following files have been modified for this update.
【Modified file】
admin/theme-options.php
header.php
languages/ja.mo
languages/ja.po
sns_btn_btm.php
sns_btn_top.php
style.css