Switch to gh-pages as default branch for tinyest deployement workflow

gh-pages branch is special : it's used by github to make content aviable as website on url like : 
http://ghusername.github.com/projectName

I also add markdown syntax to README file to add some eye-candy to the readme and because i used to see warning on each project without README.md file when importing node.js dependency with npm... So I always use Markdown flavored README files.

Off course, you can change gammanu by simonboye in the README.md to refer to your github-pages.