Upgrade restler to version 3.2.2

A test called "It is able to chain several calls" was added which proves that with the previous version of restler the module fails when chaining several calls due to a memory leak (see: https://github.com/danwrong/restler/pull/113 and https://github.com/danwrong/restler/issues/129)

This test needs a config.js file in the test folder with a trello configuration, that's why this test is ignored by default (".skip"). This file should contain something like this:

```javascript
module.exports = {
    key: "some valid key",
    token: "some valid token",
    listId: "some valid listId"
};
```