Update common files for JSON Literals.

For w3c/json-ld-syntax#4.

Author: gkellogg

common/jsonld.js

@@ -15,6 +15,14 @@ const jsonld = {
       authors: ['Domenic Denicola'],
       status: 'unofficial',
       date: 'January 2014'
+    },
+    "JCS": {
+      title: "JSON Canonicalization Scheme (JCS)",
+      href: 'https://tools.ietf.org/html/draft-rundgren-json-canonicalization-scheme-05#page-6',
+      authors: ['A. Rundgren', 'B. Jordan', 'S. Erdtman'],
+      publisher: 'Network Working Group',
+      status: 'Internet-Draft',
+      date: 'February 16, 2019'
     }
   },
   conversions: {

common/terms.html

@@ -335,6 +335,12 @@
     the value MUST be a <a>node object</a>, or <a>array</a> of node objects.
     If the value contains a <a>term</a> expanding to <code>@type</code>,
     it's values are merged with the map value when expanding.</dd>
+  <dt><dfn>JSON literal</dfn></dt><dd>
+    A <a>JSON literal</a> is a <a>typed literal</a> where the associated <a>IRI</a> is <code>jsonld:JSON</code>.
+    In the <a>value object</a> representation, the value of <code>@type</code> is <code>@json</code>.
+    JSON literals represent values which are valid [[JSON]].
+    See <dfn data-cite="JSON-LD11#dfn-json-datatype" class="preserve">JSON datatype</dfn> in [[JSON-LD11]].
+  </dd>
   <dt><dfn>typed literal</dfn></dt><dd>
     A <a>typed literal</a> is a <a>literal</a> with an associated <a>IRI</a>
     which indicates the literal's datatype.