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If I am using Rails 4.2.1, are there any setup changes or differences I need to be aware of to follow along?
For setup and other changes I don't believe there are any big changes you need to worry about.
If you are curious you can always check out the change logs for exactly what is going on at: http://weblog.rubyonrails.org/2015/3/19/Rails-4-2-1-and-4-1-10-have-been-released/