name_resolve throws an exception

Trying to use the `name_resolve` method:

```
>>> api.name_resolve('QmXfrS3pHerg44zzK6QKQj6JDk8H6cMtQS7pdXbohwNQfK')
```

Results in the following error:

```
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: request() takes exactly 2 arguments (4 given)
```
