remove server database reset
modify sync function call to async function call
modify to be extensible with datastore other than in-memory
bug fix: typo
remove cbHelper
bug fix: typo
seperate in-memory store from auth.js
hide challenge generation from auth.js
added abstract class UserStore
added empty RedisStore.js
Updated README.md
updated package.json
implemented RedisStore
updated README.md
updated README.md
Merge branch 'master' into auth_redis

Conflicts:
	README.md
Merge branch 'auth_redis'

Conflicts:
	README.md