create_option_parser()
private
Creates an option parser and fills
it in with the help info for the command.
# File lib/rubygems/command.rb, line 486
def create_option_parser
@parser = OptionParser.new
add_parser_options
@parser.separator nil
configure_options "Common", Gem::Command.common_options
add_parser_run_info "Arguments", arguments
add_parser_summary
add_parser_description
add_parser_run_info "Defaults", defaults_str
end