Camomile

- fix: fix "watch" timeout
- improve: return better HTTP status code
- feat: add Python 3 support to functional tests
- chore: update functional tests to rely on latest Python client
- chore: move documentation to external dedicated repository

- feat: {corpus | medium | layer} metadata
- feat: {corpus | medium | layer | queue } watch

- feat: options.returns_count
- feat: support metadata & watch functionalities
- feat: npm packaging
- BREAKING: make Camomile a class

- feat: filter layers by fragment_type or data_type

- feat: filter annotations by fragment or data

- feat: support for .../count routes