pairwise plugin initial commit - plugin models, controller and tests
pairwise models refactored (moved to a module Pairwise)
allow change in pairwise question name, alow add new choices to pairwise questions
removed unnecessary comments
pairwise questions now can be changed
add tests for change choice text
visual changes to pairwise questions page
added validations to change choices of questions. some minor visual improvements in voting page
handle pairwise error in views
added pairwise config page
changed pairwise vote to send user.identifier as visitor_id instead of id
fixed pairwise functionals tests
fixed bug related to send user.id as visitor param to request a prompt and user.identifier when voting, which caused repeated prompts issue
removed awesome_print require from pairwise scripts
Merge branch 'AI2942-pairwise_plugin' into stable