1.0.0-beta.3

Changed

• Improved Docker image: now it does not ship with the project sources but only with runtime-required requirements (i.e. the sandbox and richie's package installed globally).

Fixed

• Richie templates now live in core instead of sandbox.
• Reorganize the search frontend to support nested filters.
• The CI now effectively tests packaging issues.
• The apps.core.fields module is no longer missing from Richie's package.
• Fixed the bin/pylint script to work with the default database engine (PostgreSQL)
• Fixed rebuild & bootstrap Makefile rules