changed development roadmap.
rfc822 parser
rfc822 parser. split message function.
rfc822 parser. parse header function.
rfc822 parser. unquote phrase function.
rfc822 parser. parse content-type function.
rfc822 parser. parse multipart body function.
rfc822 parser. parse mail address list function.
rfc822 parser. mail header class.
rfc822 parser. mail message class.
rfc822 parser. mail message class.
added content-type attributes.
rfc822 parser. mail message class.
added text attributes.
rfc822 parser. mail message class.
added multipart attributes.
rfc822 parser. mail message class.
added message/rfc822 attributes.
rfc822 parser. mail message class.
added date attribute.
rfc822 parser. mail message class.
added mail address header field attribute.
search key parser. mail parser is replaced from mail gem to RIMS::RFC822 parser.
fetch attribute parser. mail parser is replaced from mail gem to RIMS::RFC822 parser.
imap-append command. mail parser is replaced from mail gem to RIMS::RFC822 parser.
mail gem is not need because mail parser is replaced from mail gem to RIMS::RFC822 parser.