json-ld.org playground updated

The json-ld.org playground ( http://json-ld.org/playground/) has been 
updated to use the latest syntax changes ('@literal' => '@value') and to 
include some bug fixes, eg: 
(https://github.com/json-ld/json-ld.org/issues/55). Digital Bazaar's 
C++, JavaScript, Python, and PHP JSON-LD implementations have also been 
updated to include these changes and to use the json-ld.org test-suite.

-Dave

-- 
Dave Longley
CTO
Digital Bazaar, Inc.