test fixes and dep change
Adding test case for update-replace of undependent node.
Added test case for update_replace.
replacement
asdict
Merge branch 'iterative' into iterative-adapted

Conflicts:
	converge/framework/datastore.py
	scenarios/basic_create.py
	scenarios/basic_update_delete.py
	scenarios/multiple_update.py
	scenarios/update_add.py
	scenarios/update_add_concurrent.py
	scenarios/update_remove.py
	scenarios/update_replace.py
	scenarios/update_replace2.py