Adds a 'queue' command to sonoshell.py that prints the full queue.

```Shell
python sonoshell.py 10.0.4.2 queue
0: Hugh Laurie - St James Infirmary. From album Let Them Talk.
1: Hugh Laurie - You Don't Know My Mind. From album Let Them Talk.
2: Hugh Laurie - Six Cold Feet. From album Let Them Talk.
3: Hugh Laurie - Buddy Bolden's Blues. From album Let Them Talk.
4: Hugh Laurie - Battle Of Jericho. From album Let Them Talk.
5: Hugh Laurie - After You've Gone. From album Let Them Talk.
6: Hugh Laurie - Swanee River. From album Let Them Talk.
7: Hugh Laurie - The Whale Has Swallowed Me. From album Let Them Talk.
8: Hugh Laurie - John Henry. From album Let Them Talk.
9: Hugh Laurie - Police Dog Blues. From album Let Them Talk.
10: Hugh Laurie - Tipitina. From album Let Them Talk.
11: Hugh Laurie - Winin' Boy Blues. From album Let Them Talk.
12: Hugh Laurie - They're Red Hot. From album Let Them Talk.
13: Hugh Laurie - Baby Please Make A Change. From album Let Them Talk.
14: Hugh Laurie - Let Them Talk. From album Let Them Talk.
```