Added link for 2014-07-21-cranfield
2014-07-21-cranfield announcement blog post
Add GitHub Ribbon and "Join Us"

Close #448.
Fix btn-nav position due GitHub Ribbon
Join Us -> Join
* Shorter - save real estate at the top of the pate
* #448, #462
Change to a css github ribbon
* responsive for smaller screens
* move menu over more - click will always open menu
* #462
Cross browser - stop text wrap in ff
* #462
Merge pull request #462 from r-gaia-cs/github

Add GitHub Ribbon and "Join Us"
Making things easier to find on the home page
Allowing people to see the 'instructors' list
Three short blog posts
Blog post about job in Wisconsin
Blog post about URI bootcamp
Fixing link in blog post
Adding University of Reading bootcamp
Adding Gayathri and a bootcamp
Merge branch 'master' of https://github.com/swcarpentry/site into cranfield-bootcamp
Set Cranfield blog post date to today
Another bootcamp in Melbourne
Merge pull request #519 from mikej888/cranfield-bootcamp

Cranfield bootcamp