Use OData v4 URL conventions for addressing entities

[kbarbounakis]

The path of addressing an entity and all its descendants should follow OData v4 URL conventions:

/EntitySet(:Entity-Id)

serviceRouter should be updated to use path expressions following OData URL conventions e.g.

serviceRouter.get('/:entitySet\\(:id\\)', bindEntitySet(), getEntity());

instead of the REST-like path: serviceRouter.get('/:entitySet/:id', bindEntitySet(), getEntity());

or

serviceRouter.get('/:entitySet\\(:id\\)/:entityFunction', bindEntitySet(), getEntityFunction());