CFY-796 added type hierarchy to node relationships
CFY-796 flake8
CFY-796 flake8
Merge pull request #5 from cloudify-cosmo/feature/CFY-796-relationship-type-hierarchy

Feature/cfy 796 relationship type hierarchy
Merge branch 'develop' into feature/CFY-648-workflow-mapping

Conflicts:
	dsl_parser/tests/test_parser_api.py
CFY-648 merge