Add Markdown linebreaks

We can make this readme look a bit better on GitHub
Add License information

Plugins are now supposed to specify the License in the ReadMe, as per
http://wordpress.org/plugins/about/readme.txt
Make code obviously `code`
WordPress 3.6 has now been released

This plugin still works like a champ :D
Merge pull request #16 from pathawks/master

Updated Readme