Restrict the "Anticipated ES 6" changes test.
Restrict the "Anticipated ES 6" changes test.

Native ES 5 implementations should not be tested for conformance to any
ES 6 changes. See #44.

bestiejs/json3,jcoc611/cassandraMAP,bestiejs/json3,jcoc611/cassandraMAP,yetone/json3,yetone/json3,mcanthony/json3,mcanthony/json3