Use six to make exchangelib Python 3 compatible

• Use ensure_binary to make xml data Python 3 compatible
• Add ensure_text to string concat in _parse_envelopes
• Add ensure_text for stdout
• Sort event_types for consistency

Depricate _get_shortname_from_docs method and Protocol.docs_auth_type

Deprecated _get_shortname_from_docs method and Protocol.docs_auth_type as they are no longer used in upstream

free-busy schema

handle missing working_hour elem

Fixing valueerror-item-type-http-schemas-microsoft-com-exchange-services-2006-types-item-was-unexpected-in-a-folder-folder-blocking

https://app.clubhouse.io/nylas/story/53323/valueerror-item-type-http-schemas-microsoft-com-exchange-services-2006-types-item-was-unexpected-in-a-folder-folder-blocking

ecederstrand/exchangelib#559

v1.11.4-0.14.3

Merge pull request #65 from nylas/yusra-ahmed/catch-ErrorInvalidSyncS…

v1.11.4-0.14.2: Merge pull request #63 from ecederstrand/patch-1

Fix format string

v1.11.4-0.14.1: Merge pull request #62 from ecederstrand/patch-1

Allow customizing the 'User-Agent' header

Allow variable pool_size on Protocol

This release allows passing in a pool_size to the Protocol to configure the level of concurrency per-account

free-busy-schema-fix

Merge pull request #60 from ecederstrand/patch-1

Backport upstream commit e2b43601

Backport fix for 'X-AnchorMailbox' auth header

https://app.clubhouse.io/nylas/story/49475/backport-fix-for-github-issue-635