Major visible changes:
* API endpoints are now under `/api/<collection>` by default. They used to be `/<collection>`.
* Metadata is published under `/metadata`.
* Comes with JSONSchema and OpenAPI/Swagger metadata modules.
Minor visible changes:
* Filtering on properties of related items (only one level deep for the moment).
* Validation of input and output via schemas (toggleable but on by default).
* New option to expose foreign key columns/attributes (they were always hidden before).
* Bug fixes.
* Documentation updates and improvements.
* Badges :).
Behind the scenes:
* Switched from virtualenv to buildout for development environment.
* Code refactored and split into submodules.