handle old_visitor_identifier parameter in answers

When either a vote or skip gets passed an old_visitor_identifier parameter,
we want to ensure it matches the original appearance and then create a clone
of the original appearance. The cloned appearance gets the new voter_id
information. The end result is the old session with the original appearance
will have a "Stopped_Voting" and the new session will have a vote + appearance.

[#66601646]
fix Ruby 1.8.7 tests

[#66601646]
add config. prefix to deploy scripts

should remove EY deprecated warnings on deploy
add comment to clone_expired_appearance
test against ruby 2.0.0 and 2.1.1
Revert "test against ruby 2.0.0 and 2.1.1"

This reverts commit 967a49548d00d4f5d00445705de1e934b7daac27.
Merge branch 'handle-old-session-id'
Merge branch 'master' of github.com:allourideas/pairwise-api