Fix #422, transactions & Bluebird 2.3

lib/transaction.js

@@ -73,18 +73,21 @@ require('./interface')(Transaction);
 // Passed a `container` function, this method runs the current
 // transaction, returning a promise.
 Transaction.prototype.then = function(onFulfilled, onRejected) {
-  var Runner = this.client.Runner;
-
+  var Runner  = this.client.Runner;
+  var promise = this;
+  
   // Create a new "runner" object, passing the "runner"
   // object along, so we can easily keep track of every
   // query run on the current connection.
   return new Runner(this)
     .startTransaction()
-    .bind(this)
-    .then(this.containerObject)
-    .then(this.initiateDeferred)
-    .then(onFulfilled, onRejected)
-    .bind();
+    .then(function(obj) {
+      return promise.containerObject(obj);
+    })
+    .then(function(obj) {
+      return promise.initiateDeferred(obj);
+    })
+    .then(onFulfilled, onRejected);
 };
 
 module.exports = Transaction;