LOW: Fixed incorrect image files
LOW: Formatting
LOW: Removed unnecessary inheritance
LOW: Fixed NPE in rendering when parent view is deleted
MEDIUM: Added containsOntologyObject method which allows to check wheter
an object is contained or not in another one (useful for restrictions,
intersections, unions, etc...)
MEDIUM: Added sorting in ontology bindings
LOW: Removed colors
MEDIUM: Switched to new implementation of conformsTo
Merge branch '1.5.1' of ssh://git@github.com/agilebirds/openflexo.git into 1.5.1