api & rewrite: implement clear-completd at POST /api/v1/user/clear-completed
rewrite: begin the great server-side javascript migration
rewrite & api: add reroll api route POST /api/v1/user/reroll. pretty bad
interface on client for now since I can't get the UI to update, have to
refresh. will revisit. routes/api.coffee => routes/api.js
api & rewrite: buy gems, reroll, fully converted server to JS, bug fixes