CFY-649 start work
CFY-649 enable logging in workflow context
CFY-649 refactoring
CFY-649 add relationship workflow type
CFY-649 start adding support for relationship operations
CFY-649 refactoring
CFY-649 make context capablities lazily loaded at the plugin side rather then explicitly injected during operation execution
CFY-649 finish adding initial support for relationship operations
Merge branch 'feature/CFY-642-workflow-framework' into feature/CFY-649-generic-workflow

Conflicts:
	cloudify/context.py
	cloudify/workflows/workflow_context.py