Add a few more elements introduced by HTML5
It's apparently spelled 'semantic':grey_exclamation:
Clarify where to drag files.

In the class I TAed, students were dragging the `index.html` file
directly onto the already open text editor window, which simply
inserted the contents of the file into their `hello.html`. This
was pretty confusing to them, so I had to teach them about dragging
onto the text editor icon instead of the window that was open.
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
updating rails -v references
Merge branch 'icon-drag' of https://github.com/indirect/docs into indirect-icon-drag
added warning for Heroku deployment
Merge pull request #215 from AimeeKnight/master

Alert for Heroku Deployment
remove references to attr_accessible
reorder steps for Heroku deployment
Merge branch 'rails-4-changes' of https://github.com/jedschneider/docs into jedschneider-rails-4-changes
Merge branch 'heroku-deploy-order' of https://github.com/AimeeKnight/docs into AimeeKnight-heroku-deploy-order
Add the rails_12factor heroku gem to support deploys on rails4.:
Add rails_12factor gem when deploying to heroku in curriculum
Adds CPU type checking for OSX during version check.
Added an updated image to show processor type.
Corrections from railsbridge 20130727
  Wrong directory to rm -rf specified for linux clean up
  Rails 4 is valid too
  rails installer can install ruby on osx
added notes for rails 3.x users about routes and getting the root route starting
At this point in the curriculum the votes routes do not exist - remove.
Merge branch 'tmg/minor_corrections_201307' of https://github.com/tgaff/docs into tgaff-tmg/minor_corrections_201307