get_profile is broken

Running it with both instances of the example produces the following errors. 

``` python
(Pdb) client.get_profile()
*** AttributeError: 
```

and

``` python
(Pdb) client.get_profile(field_selectors=('id', 'first-name', 'last-name', 'company'))
*** AttributeError: 
```

:dog:
