boto/boto — pull request #812 by shawnps (2012-06-12 03:42:22+00:00)
Title: Fix ec2 volume bug

I'm not too familiar with the code base, but I noticed what might be a bug by running pyflakes on the ec2 directory.

Since volume.py wasn't importing boto.resultset.ResultSet or boto.ec2.Tag anywhere, I assume this line might be a bug:

```Python
self.tags = boto.resultset.ResultSet([('item', Tag)])
```

Also added some unit tests to cover this function.