* lib/csv.rb: writes lines with "\n" when row separator is not given.

          formerly it was "\r\n".

        * lib/csv.rb: [CAUTION] API change

          * CSV::Row removed.  a row is represented as just an Array.  since
            CSV::Row was a subclass of Array, it won't hurt almost all programs
            except one which depended CSV::Row#match.

          * CSV::Cell removed.  a cell is represented as just a String or
            nil(NULL).  this change will cause widespread destruction.

              CSV.open("foo.csv", "r") do |row|
                row.each do |cell|
                  if cell.is_null       # Cell#is_null
                    p "(NULL)"
                  else
                    p cell.data         # Cell#data
                  end
                end
              end

            must be just;

              CSV.open("foo.csv", "r") do |row|
                row.each do |cell|
                  if cell.nil?
                    p "(NULL)"
                  else
                    p cell
                  end
                end
              end

        * lib/csv.rb: [CAUTION] record separator(CR, LF, CR+LF) behavior
          change.  CSV.open, CSV.parse, and CSV,generate now do not force
          opened file binmode.  formerly it set binmode explicitly.

          with CSV.open, binmode of opened file depends the given mode
          parameter "r", "w", "rb", and "wb".  CSV.parse and CSV.generate open
          file with "r" and "w".

          setting mode properly is user's responsibility now.

        * lib/csv.rb: accepts String as a fs (field separator/column separator)
          and rs (record separator/row separator)

        * lib/csv.rb: added CSV.foreach(path, rs = nil, &block).  CSV.foreach
          now does not handle "| cmd" as a path different from IO.foreach.
          needed?

        * test/csv/test_csv.rb: updated.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@6359 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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