Quote and Literal subcommands are implemented

[mslinn]

Fixes #33

[mslinn]

The modifications in the pull request have been tested against an IBM z/OS Communications Server. The following code fragment uses FTP to submit a batch job to the mainframe, and collects the results.

def parse_job_number_from(line)
  tokens = line.split('JOB')
  raise StandardError, "Error: The string 'JOB' was not found in the FTP response." unless tokens.length == 2

  job_number = tokens[1].split.first
  job_number.sub(/^0+/, '') # Remove leading zeros
end
    
Net::FTP.open(@ip_or_domain) do |ftp|
  ftp.login @uid, @pwd
  ftp.quote 'site filetype=jes'
  job_info = ftp.puttextfile @local_jcl_filepath
  job_number = parse_job_number_from job_info
  ftp.gettextfile "J#{job_number}", @local_results_file
end

[shugo]

It looks good. Thank you!