Adds new simple-headless template.
This is simply a duplicate of the simple template but with no html, head or body tags.
You can use this kind of template if you need to insert the HTML output into another HTML page.
Removes body styling since there is no body in this template.
Adds simple-headless to the docs.
Merge pull request #7 from himedlooff/simple-headless

Simple headless
Bumps version.
Merge branch 'simple-headless'