switched to plonetest layout
Plone 5

- Changed versions
- Basic test updates

Missing:
Fix tests. They use Archetypes api which is not available dexterity
Merge branch 'plonetest' into plone5

Conflicts:
	setup.py
use dev.cfg, pass version to bootstrap.py
removed Archetypes methods and interfaces wherever they broke tests, refs #329, slc refs #11003
pull in flake8 for test
switched travis to plonetest setup, refs #346, slc refs #11003