analytics.init(...) fails on Python 3.3.2

```
>>> analytics.init('testsecret', async=False, flush_at=1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\REDACTED\analytics\__init__.py", line 33, in init
    from client import Client
ImportError: No module named 'client'
```