(minor) referenceview will add 'wb-reference-<hash>' class to root element

Class for information and debugging purposes. Will update whenever the Reference gets saved.
For new references, 'wb-reference-new' will be added instead.

Change-Id: I0489be0034f62f87fecbdeb6888f65049f74d0d0
Merge "(minor) referenceview will add 'wb-reference-<hash>' class to root element"