Added social button functionality and updated quick tags

【Contents of revision】
■Detailed article social button setting function
■Quick tag update

The files that have been modified for this update are as follows
【Added files】
fonts directory
fonts/icomoon.eot
fonts/icomoon.svg
fonts/icomoon.ttf
fonts/icomoon.woff
sns_btn_btm.php
sns_btn_top.php

【Corrected files】
admin/theme-options.php
footer.php
functions.php
languages/en.mo
languages/en.po
single.php
style.css

For more details, please visit the download site for purchasers of CORE (tcd027).