Python-vaultwarden

Well, this is a big one. Here are all the changes:
- Display password hints directly on the web, as long as SMTP is not in use. Can be disabled setting `INVITATIONS_ALLOWED` to false
- SMTP integration, for now only for sending password hints
- Musl docker image
- ARMv7 docker image
- Travis CI integration
- Basic support for KDF prelogin and notification negotiation
- Add IP and username to failed login attempts
- Support passsword history
- Updated web-vault to 2.2
- Cipher import in organizations

- Updated included web vault to version 2.1.1
- Updated dependencies
- Implemented share selected ciphers
- Updated user revision date on changes, to make sync work

- Implemented password hint
- Fixed user revision date
- Improved documentation

- Added missing attachment APIs
- Used WAL journal mode in SQLite to improve concurrency

- Hide organization stuff to unconfirmed users
- Update the links to the Arch package
- Set a default of 10 workers in Rocket, to avoid poor performance in some situations
- Return 404 when a web vault file isn't found

Implemented U2F authentication