feature request: get sorted by key

[pablomaurer]

like the pull request histrio/py-couchdb#55 (use OrderedDict) it would also be nice to have an option to get docs sorted by key.

Stackoverflow recursivly sort by key:

def sortOD(od):
    res = OrderedDict()
    for k, v in sorted(od.items()):
        if isinstance(v, dict):
            res[k] = sortOD(v)
        else:
            res[k] = v
     return res