Model interfaces and exceptions
Controller interfaces
Disable mariadb tests for now; no real reason to test mariadb currently and
just wastes Travis resources
Merge pull request #6 from EXreaction/task/disable_mariadb_tests

Disable mariadb tests for now; no real reason to test mariadb currently ...
Merge pull request #1 from EXreaction/task/controller-interfaces

Controller interfaces
Move model/entity to entity/ and model/ to operators/
Fixing comment in operators/rule interface
Merge pull request #2 from EXreaction/task/model-interfaces

Model interfaces and exceptions