[#1068] Add delimiter option to parser_csv

[llby]

• some test dosen't run. because it has not arg 'param'.
• CSV.parse_line return nil from empty. so flag 'null_empty_string' do nothing.
• and same problem has test_parser_tsv.rb

[tagomoris]

Do you mean that adding col_sep argument to CSV.parse_line changes default behavior for empty string?
I think it's not acceptable for many users. Are there any way to help it?

[llby]

col_sep is not affected.
CSV.parse_line change ,, to nil,nil,nil from the beginning.
test_parse_with_null_value_pattern is not work.
because lost (param).
so I modify to test pass.

[tagomoris]

Okay, I understood that test-unit has a bug for such case: test-unit/test-unit#122

[tagomoris]

Use keyword argument style instead of specifying a hash object: CSV.parse_line(text, col_sep: @delimiter)

[tagomoris]

I created a pull-request to fix bugs you pointed: #1112
Could you rebase your change on master after merging it?

[tagomoris]

I merged #1112 .

[llby]

done.

[tagomoris]

Great addition. Thanks!