CSV is built into Ruby 1.9

In Ruby 1.9, fasterCSV has been made the implementation of the stdlib
CSV, so we remove the rubygems (which btw, is also
included by default in 1.9) and just make require 'csv' and CSV
instead of FasterCSV.

http://ruby-doc.org/stdlib/libdoc/csv/rdoc/index.html

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