Add production dependencies

node_modules/async-settle/index.js

@@ -0,0 +1,21 @@
+'use strict';
+
+var asyncDone = require('async-done');
+
+function settle(fn, done) {
+  asyncDone(fn, function(error, result) {
+    var settled = {};
+
+    if (error != null) {
+      settled.state = 'error';
+      settled.value = error;
+    } else {
+      settled.state = 'success';
+      settled.value = result;
+    }
+
+    done(null, settled);
+  });
+}
+
+module.exports = settle;