Fixed bug with schema version being cast to a float in PackageType buildAttributes()
Fixed bug with schema version being cast to a float in ContainerType buildAttributes()
Fixed bug with schema version being cast to a float in BundleType buildAttributes()
Fixed typo in from_obj; it was checking for a dictionary rather than the object
Fixed typo in CandidateIndicator constructor
Made generator constructor argument optional in CandidateIndicator
Removed exception when instantiating CandidateIndicator without id or generator
Made all arguments optional in CandidateIndicator constructor