Add developer Kim.
Fix "Grymt-Hoppa"-bug.

Jumping with carried movable objects while stuck under a fixed block no longer triggers the carried objects to jump.

Modifies GameState.filter to use a different signature. It is now filter( behaviors, type, objects ) where the last to parameters are optional. See function definition for documentation.
Merge of "Grymt-Hoppa"-bugfix and 'master'.