Fixed search results totals

Fixes:

```
INFO:spotify.session:Logged in
spotify> search queens
spotify> Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
    self.run()
  File "shell.py", line 137, in run
    stop = action(*args)
  File "shell.py", line 206, in do_search
    result.total_tracks, result.total_albums,
AttributeError: 'Search' object has no attribute 'total_tracks'
```