Imapy

- Minor syntax changes (ability to fetch email UIDs)

- Dropped support for Python2
- Updated email information retrieval syntax
- Added type hints
- Added more tests

Added
- Added authentication support

Added
- Added support to only retrieve a list of UIDs

Fixed
- Parsing bugfixes

Changed
- Reorganize tests and use tox + Travis for CI

Fixed
- Add context manager to IMAP class because gremlins had stolen it from previous release

Added
- Add a context manager to IMAP class.
- Add port argument to IMAP.connect (in cases when non-default port is used)
- Add support for attachments
- Search for folders using simple regular expressions: `box.folders('*nbo*')` will match 'Inbox' folder
- Shorter syntax for folder creation: use `make()` instead of `make_folder()`