Database schema changes and cleanup to support bonus month coupons
Model changes to support new db schema
Increment Rails version to 3.2.17
Increment gem version to 1.0.0
Moved column removals to a separate migration
Fixed acts_as_coupon_redeemable, so models that behave this way can find their coupon redemptions and coupons
Merge pull request #8 from barkbox/bonus-months

Added support for duration-based coupons (i.e. bonus months)
Added deprecation comment to Couponable::Coupon#discount_hash
Changed db/migrate path to be compatible with Rails 4.1