High level lib for work with email by IMAP:
- Basic message operations: fetch, uids, numbers
- Parsed email message attributes
- Query builder for search criteria
- Actions with emails: copy, delete, flag, move, append
- Actions with folders: list, set, get, create, exists, rename,
  subscribe, delete, status
- IDLE commands: start, poll, stop, wait
- Exceptions on failed IMAP operations
- No external dependencies, tested