adding .get_items() and __iter__() to v.p.Model
adding key
Merge branch 'develop' into feature/issue-446-iterable-model-instances
removing __iter__() overloading, call get_items() straight
Merge branch 'develop' into feature/issue-446-iterable-model-instances
adding descriptor.clean()
cleanly shaved get_items(), thanks @jerith
pyflakes fix & test-typo cleanup
replacing get_items() with get_data() and removing the export_values() functions
Merge branch 'feature/issue-446-iterable-model-instances' into develop