Split out response parser (etc) into multiple files

[nevans]

I would find it much easier to work with if net/imap.rb were split into several files. Would a patch like that be welcome and accepted? Just let me know, and I'll submit a PR right away (and if it's accepted, I'll rebase all existing PRs on it).

e.g:

• net/imap/response_parser.rb for Net::IMAP::ResponseParser
• net/imap/response_data.rb for the response data Structs (e.g. TaggedResponse, FetchData, MailboxList, etc)
• net/imap/command_data.rb for all of the #send_data/#validate classes (like Atom, Literal, QuotedString, etc)
• net/imap/authenticators.rb
  • net/imap/authenticators/{cram_md5,login,plain} etc

[shugo]

@nevans Thanks for your proposal.

Agreed. Such a PR is welcome!

[nevans]

@shugo Other than the minor changes mentioned in #22 and a bunch of documentation updates (see 9cd562a), the code has simply been moved to different files without any changes. It matched my proposal here so I pushed them directly. Let me know if you think we ought to organize anything differently. 🙂