Restore icons updating code

+ CreativeCommons in icons.json
+ SVG_symbols() call in update_icons case of action handler
+ Updated icons in combined.svg
Increase recent posts to 15 & update formatting

Show 15 most recent posts instead of 10.
Pass true to template output so that it will echo itself instead of
using
echo $template->{...}->out()
Merge branch 'feature/31'