Fix update script

I had a few old variable names laying around.
Adjustable icon on 'back' and 'more' snippets
Add 'rel' option to 'back' and 'more' snippets
Merge 'v0.3' into gh-pages-minimal

Version 0.3

Lotsa updates...

Merge conflicts:
	_config.yml
	assets/stylesheets/slate/custom.css
Merge gh-pages-template v0.3-minimal

Version 0.3 - Minimal

Conflicts:
	README.md
	_config.yml
	_includes/slate/footer.html
	_includes/slate/header.html