title: fastercsv error with ruby 1.9.2
body: <p>I have an existing rails application I'm running on ruby 1.9.2 and linux its rails version is </p>
  
  <pre><code>rails 2.3.8
  </code></pre>
  
  <p>and it has a GEMFILE as well, in its vendor/gems directory it has 'fastercsv-1.5.4' gem<br>
  and in its migrations (in two migrations) it has required the gem 'fastercsv'</p>
  
  <pre><code>require 'fastercsv'
  </code></pre>
  
  <p>But when I do </p>
  
  <pre><code>rake db:migrate 
  </code></pre>
  
  <p>it fails the migration claiming </p>
  
  <p><em>"Please switch to Ruby 1.9's standard CSV library.  It's FasterCSV plus support for Ruby 1.9's m17n encoding engine."</em></p>
  
  <p>and I have found out the message comes from gems 'faster_csv.rb' file. as it has a condition  to check the ruby version</p>
  
  <pre><code>if RUBY_VERSION &gt;= "1.9"
  
    class FasterCSV
      def self.const_missing(*_)
        raise NotImplementedError, "Please switch to Ruby 1.9's standard CSV "  +
                                   "library.  It's FasterCSV plus support for " +
                                   "Ruby 1.9's m17n encoding engine."
      end
  
      def self.method_missing(*_)
        const_missing
      end
  
      def method_missing(*_)
        self.class.const_missing
      end
    end
  
  -- and more code
  </code></pre>
  
  <p>Can someone tell me how to fix this issue. Please note 'fastercsv' has not been added to the GEMFILE.</p>