Make {} turn things into ords

Auditors: spicyj

MJLite.js

@@ -88,6 +88,8 @@ var buildGroup = function(group, prev) {
         return makeSpan("rlap", inner);
     } else if (group.type === "punct") {
         return makeSpan("mpunct", textit(group.value));
+    } else if (group.type === "ordgroup") {
+        return makeSpan("mord", buildExpression(group.value));
     } else {
         console.log("Unknown type:", group.type);
     }

parser.jison

@@ -36,7 +36,7 @@ group
     : atom
         {$$ = $1;}
     | '{' ex '}'
-        {$$ = $2;}
+        {$$ = [{type: 'ordgroup', value: $2}];}
     | func
         {$$ = $1;}
     ;