Avoid loading JSON 3 twice when testing AMD loader compatibility.
Avoid loading JSON 3 twice when testing AMD loader compatibility.

cyril-sf/kamino.js,yetone/json3,mcanthony/json3,jcoc611/cassandraMAP,bestiejs/json3,jcoc611/cassandraMAP,mcanthony/json3,yetone/json3,tildeio/kamino.js,bestiejs/json3