Minify HTML output
Make minify process a setting

Minifying is now off by default. It can be turned on for all pages by
adding 'minify: true' to _shared.yml. Or it can be turned on for an
individual page by adding 'minify: true' to the page variables.
Merge remote-tracking branch 'minify/minify' into my-minify

Conflicts:
	README.md