Use site.github.owner_url
Full URL
Kill gravatar_url
Update README
Add a link
Update gravatar site variable

Was not working for me with site.gravatar_url.  Noticed the different
variable usage (site.github.owner_gravatar_url) in layout.html and used
that.
Merge pull request #26 from iamgabeortiz/gh-pages

Update gravatar site variable
Use jekyll-sitemap plugin
Merge pull request #27 from pathawks/sitemap

Use jekyll-sitemap plugin
Changed pygments to highlighter
Removed highlighter entirely
Merge pull request #29 from jonalmeida/pygment

Changed pygments to highlighter
Ensure sitemap.xml does not show drafts