Allow strings to be enclosed in quotes

src/js/rulesAssistant.tw

@@ -247,9 +247,14 @@ window.evalExpr = function(expr, env) {
         return true;
     case "false":
         return false;
-    case "(number)": case "(string)":
+    case "(number)":
         return expr.value;
-
+	case "(string)":
+		if(expr.value.startsWith('"') && expr.value.endsWith('"')) {
+			return JSON.parse(expr.value);
+		} else {
+			return expr.value;
+		}
     case "(name)":
         return env[expr.name];