added whole system from ola4doc

sys/node_modules/tryit/tryit.js

@@ -0,0 +1,14 @@
+// tryit
+// Simple, re-usuable try-catch, this is a performance optimization
+// and provides a cleaner API.
+module.exports = function (fn, cb) {
+    var err;
+
+    try {
+        fn();
+    } catch (e) {
+        err = e;
+    }
+
+    if (cb) cb(err || null);
+};