Added functions and fixed bugs

【Contents of fixes】
■Added code optimization function to the speed-up function.
■Fixed a bug that “Hatena bookmark” is displayed even if it is unchecked at the top of social buttons.

【Modified file】
admin/inc/basic.php
admin/theme-options.php
functions.php
functions/acceleration.php
functions/head.php
languages/ja.mo
languages/ja.po
style.css

【Added files】
admin/inc/acceleration.php
functions/acceleration/class-cssmin.php
functions/acceleration/class-jsmin.php
functions/acceleration/class-minify-html.php

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