[bug 867014] Update questions/stats code to work with new EU

* fixes adding filters so they're processed
* adds a test for the questions/stats view
Add missing newrelic piece: wrap the application in it.
Change k.Graph's data format to datum style.

This means that instead of an array of x/y pairs for each line on the
graph (which duplicates data like the created times), there is an array
of objects which represent a moment in time, and all the values at that
time.

This assumes that each point in time will have a value for all of the
data points, or at least most of them. Rickshaw does not make this
assumption, but k.Graph now does, mainly because it has held true in all
the data we have used so far.

This makes progress towards completing bug 865378.
Oops. I changed a name then forgot to update the tests.
[bug 866127] Filter "what links here" by locale
[bug 867113] Implement KB forum HTML emails
[bug 867233] Upgrade django-waffle to 0.9.1