add new jc questions
Merge pull request #1 from Svetlanko/add_new_jc_review_questions_281

add new jc questions
remove unnecessary code
put dummy text into old_show view
remove unused 'select_view_for_review_id'
update feedback#show to only show the old questions or the new questions (not both)
remove now-duplicated show_four_questions from feedbacks (replaced with partial)
remove unnecessary reviews#old_show view
refactor review#summary page to have different contents depending on the type of review (new vs old)
fix javascript problem by upgrading bootstrap-sass
combine the feedback#form pages for both new-style and old-style into a single one by creating a 'questions' bank in the review model
fix the feedback view tests, add-back the 'Teamwork' section in feedback forms for old-style reviews (was accidentally removed)
fix unbalanced-html warning
Merge svetlana's changes to enable a new set of questions for all future reviews (while keeping the old reviews/feedbacks the way that they are)
rename contritubion fields to contribution fields
fix styling of review#summary to work with the new fields
fix formatting of the feedback form (unbalanced divs were fixed incorrectly)