JSON PNP Schemas

Draft 4.0 Mon 13 Aug 2012 22:43 BST
	Wrapped multiple values in array
Draft 3.4 Mon 13 Aug 2012 10:26 BST
	moved everything one level up and dropped "pnp" key
Draft 3.3 Sun Aug 12 19:19:35 BST 2012
	tiny changes to id, title, description
Draft 3.2 Thu Aug  2 19:27:47 BST 2012
     Removed afaterms- prefix
     Minor changes in extension string validation
Draft 3.1 Wed Jul 25 12:18:50 BST 2012
	Minor documentation changes - change of validator software  and change
	to schema description string
Draft 3 Mon 23 Jul 2012 18:43 BST
	complete