fixes https://www.pivotaltracker.com/story/show/76810380
fixed https://www.pivotaltracker.com/story/show/76809980
when feedback is viewed, the feedback_credit_multiplier is set to 1, so to check feedback_viewed check for a 1 value
fixes part (2) of https://www.pivotaltracker.com/story/show/76911936
Merge pull request #363 from lml/bug-fixes-20140820

Bug fixes 20140820