renamed package content to contens
UNDO moving all interfaces to adhocracy.interfaces, use adhocracy.contents/propertysheets.interfaces
added vagrant file to kickstart development with a virtual machine
Merge branch 'master' of github.com:adhocracy/adhocracy-3

Conflicts:
	src/adhocracy/adhocracy/docs/rest_api.rst
	src/adhocracy/adhocracy/interfaces.py