fix amplitude campaign name

@amillet89 it looks like the UTM fix is propagating `name` alongside `Name` (for a user's actual name) so I changed it to use `campaign` instead. 

When I tried to make the test locally I got an odd error. Let's chat when you get a sec.

Error loading resource http://170430035.log.optimizely.com/event?a=170430035&d=170430035&y=false&src=js&n=http://localhost:54546/test/&u=oeu1415821532565r0.12179974280297756&wxhr=true&t=1415821532569&f=2120713709&g= (5). Details: Operation canceled
make: *** [test] Error 1