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Our Gemfile has been very abandoned. Besides the fact that there are almost no versions specified, there are a number of dependencies that are either deprecated or in the wrong Gemfile group. This is just a small step towards a better Gemfile.
Basically, I remove deprecated or unnecessary ones and I moved to production those that should only be there. Read the commits and their explanations for more details. I also took the chance to fix couple versions, given that I was at it.