Added Google +1 button

The +1 button is for each Greyhounds profile page, and shares the
link of that page to Google+
Merge pull request #42 from zachwhaley/add-social-media-buttons

Added Google +1 button
Shortened the Twitter Follow button.
Removed the underline on the Google group button.
Added a Github star button for the site

This links to the site's source code on Github.
Merge pull request #43 from zachwhaley/add-social-media-buttons

Add social media buttons