quoting issues with rnrclient/rnr-server

There are currently issues with the quoting around rnr-server and rnrclient.

In the current staging server there are two problematic apps:
u"Déjà Dup Backup Tool"
and
"Blender (windowed)"

For dejadup it appears the code needs to be:
    appname=u"D\u00e9j\u00e0 Dup Backup Tool"
    reviews= rnr.get_reviews(language="en",origin="ubuntu",
                             distroseries="natty",
                             packagename="deja-dup",
                             appname=appname.encode("utf-8"))
This will translate to:
$ curl 'https://reviews.stging.ubuntu.com/reviews/api/1.0/en/ubuntu/natty/deja-dup%3bD%c3%a9j%c3%a0+Dup+Backup+Tool/'

But blender needs a quote_plus:
    appname=u"Blender (windowed)"
    reviews= rnr.get_reviews(language="en",origin="ubuntu",distroseries="natty",
                             packagename="blender",
                             appname=quote_plus(appname))
in order to find data.

get_reviews() will call quote_plus() too, it appears that the server is doing a double unquote_plus in api/handlers.py:101