Added quick tag and social button functions

【Contents of modification】
■Added original social button setting function (selectable from 4 types of button styles)
■Quick tag function added.

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
Fonts/common/no_image_card.gif
sns_btn_btm.php
sns_btn_top.php

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

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