Remove ReplyToken#new_reply_token
Always generate new reply token when creating User
Make intent of FillInReplyTokensTransition clearer
Create ReplyToken.generate to save key strokes
Use double quotes for mister @houndci
Add 'not null' constraint and index to reply token
Remove FillInReplyTokensTransition

Removing this because we now have a not null constraint. It is
impossible to test this transition.
Default emails from team@trailmix.life
Use email reply token instead of today@trailmix
Support old emails to today@ at the same time

There are probably some folks that will take a day or so to reply to
older emails. We should support both until we don't see anyone hitting
today@trailmix.life.
Remove unnecessary reply token parameter