Remove DB and other ignored files

https://github.com/learn-co-curriculum/rails-dynamic-request-lab/blob/master/Gemfile#L30

The Gem is old and will prevent learn from running, since it will need bundle exec.

This is part of a bigger conversation. I think we either add bundle exec in the learn gem, or figure out how to update these dependencies through some sort of audit.

Just a heads up about this: the difference is in the routes -- if you use
get "students/:id", to: "students#show"
as it suggests, instead of
resources :students, only: [:index, :show]
end,
the tests won't pass when "index" is missing.

Also, the relationship between this session's lesson and the lab, isn't good. It's the start of rails, and there should be more explanation about routes, since this is a big change from Sinatra. The list of requirements should be clearer and more descriptive, again, because this is the beginning of Rails and things are very unclear. The lessons go over the big picture of RESTful conventions, which is great, but to improve the intro to Rails, definitely include more on the specifics of routing, and the new relationships of MVC.

Thanks!

PROBLEM: Update solution. See issue #6
NOTIFY: @MiriamPeskowitz