Removed `Survey` and `Ratings` sections from FeedbackDemo, added `Events`. Fixes IOS-484 and IOS-274
Removed `Survey` and `Ratings` sections from FeedbackDemo, added `Events`.
Fixes IOS-484 and IOS-274

apptentive/apptentive-ios,hibu/apptentive-ios,hibu/apptentive-ios,apptentive/apptentive-ios,sahara108/apptentive-ios,Jawbone/apptentive-ios,ALHariPrasad/apptentive-ios,sahara108/apptentive-ios,Jawbone/apptentive-ios,hibu/apptentive-ios,apptentive/apptentive-ios,ALHariPrasad/apptentive-ios