add exires to cookie remember_device, otherwise, cookie is expired when the browser session ends
Update README.md to be gender neutral
Merge branch 'fix-remember-device' of github.com:xinminlabs/authy-devise into next-release
Fix some tests and warnings in ruby 2+
Update some dependencies.
Bump up version to 1.5.1
Merge remote-tracking branch 'origin/master' into enable-account-locking