Added functionality to disable helpfulness rating buttons upon
successfully submitting a helpfulness rating.

Modified ReviewData.java's get/setReviewId() to be get/setRid() to work
with the spicebot library.
Fixed some checkstyle errors and a bug involving views and insufficient
getParent() calls.
Added an extra getParent() call.
Implemented code to check if the user has already rated a review and
disables the buttons if they have.
The if case to check if helpfulness rating buttons should be disabled
now uses the right method. It doesn't work due to a server side bug.
fixing merge conflicts with helpfulness-rating branch