add_gem_filters

# File railties/lib/rails/backtrace_cleaner.rb, line 31
      def add_gem_filters
        Gem.path.each do |path|
          # http://gist.github.com/30430
          add_filter { |line| line.sub(/(#{path})\/gems\/([a-z]+)-([0-9.]+)\/(.*)/, '\2 (\3) \4')}
        end

        vendor_gems_path = Rails::GemDependency.unpacked_path.sub("#{RAILS_ROOT}/",'')
        add_filter { |line| line.sub(/(#{vendor_gems_path})\/([a-z]+)-([0-9.]+)\/(.*)/, '\2 (\3) [v] \4')}
      end