use couchdbkit==0.6.5.5

This seems to have been causing some issues. If I do the following,

```
pip uninstall jsonobject jsonobject-couchdbkit
pip install jsonobject==0.4.2 jsonobject-couchdbkit==0.6.5.2
./manage.py shell
```
I get an error. If I do

```
pip uninstall jsonobject jsonobject-couchdbkit
pip install jsonobject==0.4.2 jsonobject-couchdbkit==0.6.5.5
./manage.py shell
```

everything works great.

The diff between those two is just https://github.com/dannyroberts/couchdbkit/compare/7e8450b9e515366f0c2e4bcdf9552974103910fe...0994bbdad12c319c90000c734aa584a3c28d83cb, so it's like pip is getting confused and installing the wrong version of jsonobject (and a different one than it claims in the output!!!?)