Use a better key / variable name - filename -> file_path.

Also update affected tests.
[STORM-808] Fix resource response sorting using ?sort query param.
Merge pull request #790 from StackStorm/STORM-808/entity_sort_fix

[STORM-808] Fix resource response sorting using ?sort query param.
Merge branch 'master' into sensors_process_sandboxing
Make get_trigger_types method a class method.
Update manager to use MultiProcessSensorContainer (w.i.p.).
Update variable name.
Update container manager.
Make the process container more robust.