Fixed multiple bugs

【Contents of fixes】
■Optimization of breadcrumb list.
■Fixed a bug in the widget “Designed Article List 2” that the No image image is not displayed when an article without an eye catching image is displayed.
■SSL support
■PHP7 support

The following are the files that have been modified for this update.
【Modified file】
breadcrumb.php
comment-style.css
functions/ogp.php
images/style_sp.css
style.css
style_pc.css
style_sp.css
widget/ad.php
widget/google_search.php
widget/news_list.php
widget/press_list.php
widget/recent.php
widget/styled_post_list1.php
widget/styled_post_list2.php