* Moved implementation of getting and updating a DOM wrapper to ve.ce.BranchNode
* Updated ve.ce.BranchNode tests
* Renamed ve.NodeFactory.createNode to ve.NodeFactory.create
* Added ve.NodeFactory.lookup which gets the constructor of a type
* Added attribute pass-through to ve.dm.BranchNodeStub
Change-Id: I8f5b7d3d3ae616cc5f39828b24b655163d782ae5
* Makes it simpler in the linear model because we don't have to use style: "item" for regular list items and style: "definition" for definition lists
* Enforces correct nesting through existing node rules systems
* Updates tests accordingly
Change-Id: I64d80af938e325f1961226505bdc386bb35ccdda