Update SVG <symbols>

Now includes:
+ 'images/logos/github.svg',
+ 'images/icons/rss.svg',
+ 'images/logos/Google_plus.svg',
+ 'images/logos/Facebook.svg',
+ 'images/logos/twitter.svg',
+ 'images/logos/YouTube.svg',
+ 'images/logos/git.svg',
+ 'images/icons/issues-open.svg',
+ 'images/icons/envelope.svg',
+ 'images/icons/people.svg',
+ 'images/icons/info.svg',
+ 'images/icons/copyleft.svg',
+ 'images/logos/CreativeCommons.svg'
Load & use combined.svg

Load the combined SVG file the end of <body>
Update many icons/logos with <use> instead of inline SVG or <img>s