Replace .rvmrc by .ruby-version
Also relax the requirement. The .ruby-version represents merely a recomendation for the Ruby version. The incompability issues in the Ruby world are far less currently, than they were when we introduced strict version enforcement. Thus strict enforcement is no longer appropiate. Same holds for RubyGems. This implicity also removes the recomendation on using RVM. The .ruby-version file is supported by all major Ruby version managers. Gemsets are no longer a needed feature since Bundler handles multiple concurrrently installed Gems just well.
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