EntityView::getHtmlForClaims separation into getHtmlForClaim

This makes the getHtmlForClaims a little more comprehensible. Also removed generating the
"wb-first" and "wb-last" html classes since they are not really required anywhere.

The new getHtmlForClaim is protected for now since it would not deliver the output expected
when called on its own (no link to the used property).
EntityView should still be refactored so rendering of one piece of the data model is done
in a particularly dedicated class for that piece.

Change-Id: I71b695ea720529bc88a9140984326231c9a4622c
Basic EntityView PHPUnit test

Change-Id: I33b2c32ae6a62062b37dc2bb8c0f8a3caf951068
Merge changes I33b2c32a,I71b695ea

* changes:
  Basic EntityView PHPUnit test
  EntityView::getHtmlForClaims separation into getHtmlForClaim