Soft-deprecate Leopard by telling people to upgrade to Snow Leopard if possible
correct capitalization of About This Mac

The word "This" was capitalized sometime in the 10.3 days. Our docs should match what the student sees.
Rails 4 routing and attr_accessible changes
* Routing
** Rails 4 moved the root example from bottom to top of routes file
** the static index.html page is now a dynamic file at welcome#index and not a static file in public

* attr_accessible
** Rails 4 has moved Mass Assignment responsibilities to an external gem
** In order to mass assign object attributes through a model you have to add the strong_paramters gem